Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9f3f9a0d6f25a8…

MALICIOUS

PDF

44.4 KB Created: 2020-10-28 21:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a8faf606bc7015aa32fc455ed1339af7 SHA-1: 9236c5cd7fc20c5ae2100fdfef4e8c25d927f653 SHA-256: 3b9f3f9a0d6f25a8bdf657d5ec29eb3a38b74f0a75cccb73c7d63dcc53c86d76
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, including disposable ones. The primary link leads to a redirector, suggesting a scheme to drive traffic or potentially distribute further malicious content. The ML classifier strongly indicated maliciousness, and the link farm behavior aligns with SEO manipulation or traffic generation tactics.

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://ggtraff.ru/123?keyword=2005+nissan+350z+factory+service+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f89c01e9b17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f9157440aa67.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5849510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5f961cf357922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8b91792eaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f8b543e68587.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/2047907.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/7b3445ce.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bc2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5f9426f37d37d.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/4363cdb4.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/dagegafigiz_vobogaduv_xopused.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/waring_pro_wine_chiller.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/11741238333.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/39795639396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/riwuwunawalexijemamiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0279/6442/files/bafege.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/81058507283.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_off00006a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 5704 bytes
SHA-256: a304d4c6e1021a475fd9516b2f016aab57b46dd4bbb9d05610ee1e16481bac9f
font_01_sfnt_off00007e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E07 11616 bytes
SHA-256: 91e840b4843a4cac64a3f2b0ad6d8254866951010a12925139ea52ca9c8af98e

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