Malicious PDF — malware analysis report

Static analysis result for SHA-256 579a99fe47daf44f…

MALICIOUS

PDF

53.8 KB Created: 2020-08-15 17:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49c85cdaee9987fe76d31925fa2bbf0 SHA-1: 6a796a25a09e3b98996b28b6d6f5a82e4e056336 SHA-256: 579a99fe47daf44f14610d65892b309b377835816f2c8ccc366e68733e15d53b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wb?keyword=chevrolet%20lacetti%20service%20manual%20download'. This URL is embedded within the document body, disguised as a service manual download. The presence of numerous other PDF links, many hosted on Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector is the malicious redirector.

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.ru/wb?keyword=chevrolet%20lacetti%20service%20manual%20download
    • http://files.countrycrossingspringridge.com/uploads/1/3/1/6/131637850/lerize.pdf
    • http://dusam.bauteckmarine.com/uploads/1/3/0/8/130874240/8555895.pdf
    • http://files.thecountrywrensnest.com/uploads/1/3/1/4/131407088/4080863.pdf
    • https://cdn.shopify.com/s/files/1/0439/2982/9544/files/present_and_past_tense_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/5916/5849/files/which_timezone_is_utc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/tesis_biblioteconoma.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/85236572116.pdf
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/42035394087.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/44391134146.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/59249311885.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0775/files/66520599465.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/tusavulefolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0548/3942/files/duwuregafopikomomalod.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/estadistica_para_administracion_y_economia_anderson_8_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/dutaliwobuvone.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/esc_guidelines_antiplatelet_therapy.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601c.bin
7839c4a63d94c711370d5f02f720fe6d3321ff4f027d6cdadb05e2016ec2cceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 5236 bytes
font_01_sfnt_off000071ce.bin
9f88afc1715c7b170be8566e718443f266bb3d971a3e478f76ad21fb76e14d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 15588 bytes
font_02_sfnt_off0000a253.bin
69a720d952d1bdce5a77332d655374e41168874901745075c161522a6aca77a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA253 16496 bytes
font_03_sfnt_off0000b8c1.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 4324 bytes

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