Malicious PDF — malware analysis report

Static analysis result for SHA-256 39016fdd87dbb2b3…

MALICIOUS

PDF

48.9 KB Created: 2020-08-06 21:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a7197f61ea47086d29fb5b0a471eb1 SHA-1: 791812b3ccb28bbfb3bee77580d8643669104528 SHA-256: 39016fdd87dbb2b3b5a63f07ed1781563d0b8f6a21ed6fc48aca978c661196a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or redirection. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure users with the pretext of 'maths formulae for class 8 pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links within the document.

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.com/pify?keyword=maths+formulae+for+class+8+pdf
    • http://files.letscreateart.com/uploads/1/3/1/6/131606815/781131.pdf
    • http://files.cactusmoonshine.com/uploads/1/3/2/8/132814166/300c70ab.pdf
    • http://files.bgofalaska.com/uploads/1/3/2/3/132302963/2983338.pdf
    • http://xoxubo.saltwaterstivesbb.co.uk/uploads/1/3/2/6/132695306/8c962d9d1.pdf
    • http://files.blankaphotography.com/uploads/1/3/2/7/132740214/xudomipofug_rarojakawame_detafezemuwu_xuzizutuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4053/7750/files/kejewos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/burenokodasusunibupamoku.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/tratamiento_farmacologico_alcoholismo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/55363010364.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/voponetupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9167/9639/files/gosobamasofavexuxejumike.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/jukukurojasidefulodude.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/poxuxikimusi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/91680682253.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/biografia_de_camilo_jose_cela.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/rabibesinasoda.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007457.bin
3bca170aa79a120405b76f072e1b6a78d110b0cbe339381264a80403ab253ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7457 5592 bytes
font_01_sfnt_off00008740.bin
fa2e81e1bac54fa43c481ec763aecfe0e0630b7798619ab1b95a2ac93884fa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8740 15100 bytes

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