Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe500142c63bbe2…

MALICIOUS

PDF

59.6 KB Created: 2020-08-07 22:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12af07c2b4cf761b23096e9cbac0a2bc SHA-1: 1949988a779c407376888c6fbd6893b08cc581ee SHA-256: 7fe500142c63bbe2522852d812b1879f7ddbf1d383ed7bd3c0c67d06c36c399e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=resistencia+antibioticos+pdf'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the redirector URL, reinforcing the malicious intent.

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=resistencia+antibioticos+pdf
    • http://files.ganderinn.net/uploads/1/3/1/0/131070001/zixoximuw-sebarugelapogi.pdf
    • http://files.fynemods.co.uk/uploads/1/3/0/9/130969448/zesafavojix-tiwerew.pdf
    • http://files.alioleary.com/uploads/1/3/0/8/130874029/04166cf4af.pdf
    • http://tilidexep.theessaydoctor.com/uploads/1/3/0/9/130969754/jusewalofo-lupixunixi-ziwedijexokifol.pdf
    • http://files.leannecunningham.com/uploads/1/3/0/7/130775413/fiwamupezebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3000/3355/files/passive_voice_writing_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6288/files/apotheosis_of_a_demon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/jovere.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/56325115608.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/65509605401.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3077/files/29167399764.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/67173048178.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20880330559.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/xipim.pdf
    • https://cdn.shopify.com/s/files/1/0450/0871/5940/files/mental_retardation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/budegurawovajub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4982/0065/files/nojepenabunemawi.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_off0000a4a4.bin
b0cb7604ad6d36a92d114dc47d4f268cc075a6780296f6121ee5ac457fa3c973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A4 5168 bytes
font_01_sfnt_off0000b650.bin
d4e5576d1e20d273602195bc6cbffb9be4acfde1dd776d78979d24de63752c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 13756 bytes

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