Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d66128468181401…

MALICIOUS

PDF

48.3 KB Created: 2020-08-13 17:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 590c6defafae51f3c201d0b88606ec53 SHA-1: b5d90b8f5fd730ef1f112b96a2657b4ef79d0028 SHA-256: 7d66128468181401332c2bbc15c218bd79412810f348a4077169feefe28a73d8
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wb?keyword=libro%20de%20stoecker%20refrigeracion%20pdf. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links to other PDFs, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent to redirect users.

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.cc/wb?keyword=libro%20de%20stoecker%20refrigeracion%20pdf
    • http://files.donjasdogs.com/uploads/1/3/0/8/130874180/lajadewag_muxisovulopamu_wuminowegi.pdf
    • http://files.angoloitek.com/uploads/1/3/2/7/132712093/59651.pdf
    • http://tezevep.falsefloorcreative.com/uploads/1/3/1/4/131437462/palaparewigug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8190/7870/files/participatory_assessment_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/latibor.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/98025975840.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/past_tense_passive_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/78853823281.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/effective_computer_security_and_risk_management_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/84671998053.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0471/files/rulaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/kutam.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3750/files/apparel_merchandising_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/destilacion_por_arrastre_con_vapor_de_agua.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006284.bin
4b7f05680058f9ee241da671c28f8346f9bdda2cee4396c48a8cdecca69b6781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6284 5436 bytes
font_01_sfnt_off0000750d.bin
9751c2e62f8c8df055de78034291dba2978befa6e95a3cea523d07e5b5887eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750D 12712 bytes
font_02_sfnt_off00009ef7.bin
1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF7 16140 bytes

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