Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d9fc4f0477a8c1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-02 02:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dc55ac9aa8251d0d5ae384b59ef7f56 SHA-1: a0fbf46c439611ef8484f990a1e116d2da96aec1 SHA-256: 70d9fc4f0477a8c1ff3a468fc7814bb6ca4951cd9fdb95a850dc4524e2d21fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and a URL that appears to be part of the link farm strategy.

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/pify?keyword=lil+wayne+fwa+review
    • http://files.growingforwardnow.com/uploads/1/3/1/8/131856276/04bc5f.pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://files.bodyglow.co.nz/uploads/1/3/2/7/132740536/basifoliw.pdf
    • http://files.salightgroup.com/uploads/1/3/0/7/130738822/cac1a74441957b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/94829736096.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/barogegofomuzavagobotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/meta_and_link_tags.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/gewozovizadufakaxaxokez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/pafaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/66375285459.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/33714601273.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/vojuguzotabut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/super_smash_bros_3ds_dlc_codes_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/59135851721.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/xorurezeguzizaxado.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/3989350932.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/55063138869.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8673/files/lanug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/saveburiga.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_off00006fb9.bin
ef18cda7f6a4fa6a3f7060f7825a7102e955bff0cda8e066002222ac24e3d729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 4776 bytes
font_01_sfnt_off0000802d.bin
6974e9dee36c4e51d25b72af81da2f8243918585593a0ae5fb17fd76772ca131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 11148 bytes

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