Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aff53b1b1345e9c…

MALICIOUS

PDF

43.4 KB Created: 2020-10-28 11:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6ab7be4cb7d0bf70a3f1e85af76e8d8b SHA-1: 28a604d77b979adf0a1e9cdcb2c74d6138915720 SHA-256: 8aff53b1b1345e9c03abfd2d4e538deaf1d3e734e54611960e5c261581acdf3f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.link/123?keyword=utorrent+apk+free+download+apkpure In PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/2db5cf.pdfIn PDF document text
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/3371919.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/7b96d34382e.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/5925643.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/koturelorozetol.pdfIn PDF document text
    • https://paseboke.weebly.com/uploads/1/3/4/4/134432883/03cc17f3ed99.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/1/0500/5652/8032/files/39231112708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/rogers_cable_canada_tv_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1048/9024/files/jepelalerurowezifaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1239/0038/files/40106172540.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/8118743016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1871/7864/files/xapiwozuxaxodebugaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/original_3d_crystal_puzzle_purple_dragon_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4303/5562/files/cross_court_tennis_2_apk_unlocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7326/6352/files/zilakibow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1054/1726/files/apc_smart_ups_2200_ux_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/lepisavabivotisez.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_off00006a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6C 5004 bytes
SHA-256: 842d1635b817b8b14ea7a234622fba81779cafa3c1f4ab89a456e9eefbe38381
font_01_sfnt_off00007b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B93 10920 bytes
SHA-256: 2a7c09712251ab2a2e3e6c95dd05b33ed3d7e7031a622abbbb3c985cf6353911

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