Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc72a2432f19f4a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 19:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa89a7c30fa9b0df68f9ecf7ac7e9e97 SHA-1: 95eae5bd802e8dac964a571ab2e7e93e359a6c8b SHA-256: 4dc72a2432f19f4a189d0409c8acf29497123440cf69ef14a2b583205b990716
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded external links, many of which point to a redirector service. This indicates a likely attempt to lure users to malicious sites. The presence of numerous PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=barriers+of+communication+process+pdf
    • http://files.supportiveimmersion.com/uploads/1/3/1/3/131378943/jorinikixovejuf.pdf
    • http://files.premiertintpros.com/uploads/1/3/0/7/130739570/851239.pdf
    • http://files.differentpicture.co.uk/uploads/1/3/0/8/130814118/b8e1f676.pdf
    • http://files.birdingaroundnyc.com/uploads/1/3/1/0/131070842/gawelorojat-busipexibovo.pdf
    • http://files.anntowell.com/uploads/1/3/0/8/130874474/7527669.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/68022236840.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/49088060939.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/72573813131.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/29951483612.pdf
    • https://cdn.shopify.com/s/files/1/0433/7949/0968/files/55739097442.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/43466004817.pdf
    • https://cdn.shopify.com/s/files/1/0447/4611/3173/files/que_es_el_bioplastico.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/divodunerodapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2650/files/wetamomuresexejosivobup.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/buxafamuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/28571531003.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/freeshop_qr_code.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/
    • https://cdn.shopify.com/s/files/1/0432/7309/3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e6.bin
4f84bc24afa0fdd1923f9e7061c5de82ec5a1e83adf61cac180a7420d4074123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E6 5320 bytes
font_01_sfnt_off000077e6.bin
b2ee0579efa1cb6257a9f235a1df3374b36549f74111dd1bc89f440f81188132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 9712 bytes

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