Malicious PDF — malware analysis report

Static analysis result for SHA-256 167d2959a25ddb76…

MALICIOUS

PDF

43.0 KB Created: 2020-08-18 22:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd010ded365873b8cf2b3a65e6c4f5cc SHA-1: 0bbbea418c43a0a741f77c652f5a55e09e5c83fc SHA-256: 167d2959a25ddb7656275de6d17899c94ec19bad83c12141ce7a6b7e45018415
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 for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=administracion+publica+pdf+unam'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links and the redirector heuristic point to a malicious redirection scheme.

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=administracion+publica+pdf+unam
    • http://seduto.beyondseating.com/uploads/1/3/1/0/131070851/9811442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/stereo_love_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/72345806959.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/zosinivesokomim.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/bibomiramasesabe.pdf
    • https://cdn.shopify.com/s/files/1/0450/9263/4789/files/canon_lide_220_scanner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/wutimosap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/menomorosiwixarolapon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/puzarusaruvipevogutikaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/lamb_of_god_ghost_walking.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/dapugufivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/guguxiwafe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a30.bin
246bf70c66398372ef9541a80a7197d5caa5f88fb885cd45c79117122575f47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A30 5196 bytes
font_01_sfnt_off00006ba8.bin
a31bb5c108fc1b931c4eacb3e3f3f61b612359f2655dd3c9acacb230722fc9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA8 11044 bytes
font_02_sfnt_off00008fa4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA4 4324 bytes

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