Malicious PDF — malware analysis report

Static analysis result for SHA-256 134940ccefe8a541…

MALICIOUS

PDF

47.7 KB Created: 2020-08-10 05:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1470e07a8762a81a77c159a7be82556a SHA-1: 894fbad9c3bf065829d7efabd23162de2adac17d SHA-256: 134940ccefe8a541b3d45683d2ef5e7835acea7980bb62ddd32e49877d64441b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains that appear to be part of a link farm. One of the primary links, however, redirects through ttraff.com, which is flagged as malicious. This suggests a phishing or scam attempt using SEO techniques to distribute 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=add+and+subtract+fractions+with+like+denominators+pdf
    • http://files.trinitybergenlutheranchurch.org/uploads/1/3/1/3/131379320/7210037.pdf
    • http://files.bcchildandyouthincareweek.com/uploads/1/3/1/4/131452997/gofirefex.pdf
    • http://files.oceanairandsaltyhair.co.uk/uploads/1/3/0/9/130969889/jotigolopapu.pdf
    • http://files.stevescustomcarpentry.org/uploads/1/3/1/4/131437980/vuxuliwexozirajub.pdf
    • http://raturixat.pianoscore.net/uploads/1/3/0/7/130738732/pivasugeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4504/3876/files/pdf_botany_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lasuzopaxikabade.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/fifavuwavarebobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/60688216969.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/squareup._com_receipts.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/bayesian_statistics_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/99332846300.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/jikuzasijifukebadat.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/sedentos_por_avivamento.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/59802511722.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/asian_paints_apex_ultima_shade_card_download.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_off00007bf8.bin
2b9a0fd07a3ea6ce10523bcb5a15f08abaf6771c10ab0c710fe0a4bbee931800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 5680 bytes
font_01_sfnt_off00008f2c.bin
e49d5d2e50c4bb346472dc64fbd77ce7d74e9ef59970a6f6d31c06344ab814aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2C 9920 bytes

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