Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba58acbdf446d3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 03:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d56633a1c7fca6eb8344bffced6ab14 SHA-1: ad01fb172db03d9c04941b16875af92e4ab42732 SHA-256: 67ba58acbdf446d382d8abe0fc99afbb21f42fd959fe005260233b8becfb4a68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/pify?keyword=cxc+biology+past+papers+and+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic papers and the malicious redirector URL, indicating a lure to potentially 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.com/pify?keyword=cxc+biology+past+papers+and+answers
    • http://files.purplehobbies.com/uploads/1/3/1/8/131857758/vegusivekab_xipigazi.pdf
    • http://fomimino.bridesloveyoga.com/uploads/1/3/0/7/130775740/nutevamaboj-faberob-memitadolox-fudenufizozuto.pdf
    • http://files.langleysawmill.com/uploads/1/3/1/3/131380493/1ad7c922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/architecture_firms_in_chennai.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/19284694098.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/rizaxutidus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/nimikefaxixikisipepof.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/tyranid_painting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4955/files/types_of_agricultural_machinery.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/jibopixukavuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/kakefere.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7977/files/14741958327.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/dovosasegot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0438/0363/9970/files/download_asterix_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/famogebomil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/as_time_goes_by_piano_solo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/94809266104.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_off00006ded.bin
00c3bfe82a0e72b95ac446e9cbaa8cb46d2180a4a941cbada9fe1fa0cf9e47a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DED 5548 bytes
font_01_sfnt_off000080e2.bin
b89b48dafde410d67ca71bf8f390271dafc65d4be54a246b43756f7bd1c458c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 11080 bytes

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