Malicious PDF — malware analysis report

Static analysis result for SHA-256 649c87067f8d8646…

MALICIOUS

PDF

45.3 KB Created: 2020-07-29 11:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af0fb2d7e5557f8a66168f9446c00ebd SHA-1: 6be470f95f7023aa3688751af4615e46303626a8 SHA-256: 649c87067f8d864602e048da67b775f67cf626b0d8193fac52716b029091391d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=autismo+adultos+pdf
    • http://files.breastcancerstartupchallenge.com/uploads/1/3/0/7/130776268/nenajuxo_rovivadezaboxe_makogadawezizi_luzavaxifidi.pdf
    • http://files.mckinneyssa.com/uploads/1/3/1/4/131454523/difodubafutu.pdf
    • http://files.farmingtonrestaurantweek.com/uploads/1/3/1/8/131856852/powedudodojabivez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/63927532237.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/kubaxigemosemedititawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/venuxakosibot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/wepagudikezivabawobuwazop.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/83864216230.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/45595208528.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/93419378068.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/mivofimenizotiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/2597118174.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/24168776517.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/26407640.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/25275374955.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_off0000758d.bin
671f24dd1a8ff842fbae168d018b71f823b755ac9b3589855345360d13b3e8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 4740 bytes
font_01_sfnt_off000085a8.bin
25947d5d0746230515c6e3fed0e76c86476bdc984c23044295336d7dbd674087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A8 10112 bytes

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