Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb82a90df861c6e9…

MALICIOUS

PDF

48.6 KB Created: 2020-10-17 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e9cfff8bb3c0596246768b7e2ece4ff2 SHA-1: 84f1614b3e53bb62ca46f4e12bb73e54666d81b6 SHA-256: bb82a90df861c6e9653780da0e5a1e5d17887cc8178f45c15c0dd351aa69f3c2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many pointing to external PDFs hosted on various domains, characteristic of a link farm. One of these links, https://gettraff.ru/123?keyword=missguided+code+off+sale, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=missguided+code+off+sale In PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/kogog.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/vatekejawejaw.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/e4e04ccb83ff3.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/813cf1644869f.pdfIn PDF document text
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/2086624.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/9165930.pdfIn PDF document text
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/dofazaru_sobedukiveweba_jizezowafodef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f8a782aee95e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8741d371f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8a502a82b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f89787d84734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9729/1941/files/66361662316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/9306/2556/files/warhammer_40k_index_imperium_1_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9456/7840/files/mexuduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5153/9866/files/elturel_battle_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87103be7-2683-4f3e-8a13-8d7d1c29dbaf/vaxali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8efa04-6af8-4bd4-8075-c4d48dcb4a27/piforuwun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f02f67-84b1-4769-9d52-c50018b57704/lerilifakituxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5876f25c-b645-4e04-9a48-742779d49d63/zufuxexejivunijijexoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82f47a9-b740-4e36-a7fd-5416149f4f4e/67446792114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f8825b-0336-461a-adec-7e2cda2f5ded/dojemoruturekijalilezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6901ba-873f-46dd-b72e-d8f614012667/safebedox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19966cc-5887-4406-bbab-8d20ca126d96/xiwojoledopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7bf996-5223-4392-b2ed-0c54a8870a89/sumexiwule.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC8 5096 bytes
SHA-256: 10c7990c5d96594f9071a15a0b61bee5e20971971396c0ed2e6f63cbe23a90e5
font_01_sfnt_off00008f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F38 10936 bytes
SHA-256: c61dc7ed773111b523c650544e326aab8c667febbbffe2c76511d831ec310779

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