Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a806aef62e0955…

MALICIOUS

PDF

42.6 KB Created: 2020-09-18 11:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d82181c658a31b3baf6f1a21aff2d86 SHA-1: 258902c31a3d5bcabbec2c97f4923822744c8ba7 SHA-256: 07a806aef62e095587424339c020bf7dd68a7e6196d45e97e228e3287bf9d5d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. Another critical heuristic, PDF_SEO_LINK_FARM, highlights a large number of external PDF links, suggesting a link-farming or spamming operation. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.me/wix?keyword=free+tetris+unblocked+games
    • http://files.paperandpoppies.com/uploads/1/3/0/8/130815277/de9b75b5b2e9e14.pdf
    • http://sigime.cindyveach.com/uploads/1/3/1/3/131398091/rejejijenubuvav.pdf
    • http://files.wcecoaching.com/uploads/1/3/1/3/131380616/335391df4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8f4eff3-f5d2-4c7f-80f5-3507bd0032ce.filesusr.com/ugd/784815_d3a16e5faf5548ae94a14443ce645299.pdf?index=true
    • https://dfbc983e-010b-485e-b1d7-e06a3d0cd460.filesusr.com/ugd/e73fea_a54cceeeffc64c0fbaa173210f7a1a51.pdf?index=true
    • https://f2d206b7-65c9-4b3e-ab87-ebd1c706a87d.filesusr.com/ugd/accd1f_0a83515853d1446194fc404dcf8583f9.pdf?index=true
    • https://34e288da-463d-4332-b6b4-8a8a7b401517.filesusr.com/ugd/278743_3bd675169784426e9021fedf82a04c16.pdf?index=true
    • https://d97a4d51-de04-48d6-880c-f2747644a04d.filesusr.com/ugd/5e81b9_b5d5c7afdcf84f0c88e7f0a104338d40.pdf?index=true
    • https://a7898eb8-c20a-48f4-a39e-674d3bc61a8f.filesusr.com/ugd/f1780b_7f4175d94e9f4ece801583174a0039f5.pdf?index=true
    • https://316cbc22-c7f2-47b5-863b-ffd3b43954af.filesusr.com/ugd/64bd79_1bace3be8cf34ad8a5324cfec2e2ff25.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/livuvadigiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/34295823542.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/sqlite_android_studio_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3277/files/albuquerque_hourly_weather_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669b.bin
959226497540f2123656fb8e064b0db907a4c9fb74807eb4b484ea1541dac8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669B 5420 bytes
font_01_sfnt_off000078f5.bin
2ba68cfbcb31189e30cd59d91e6eb0ae382b5da6028e10832446e711b2a9f56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 10764 bytes

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