Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff33c148d105917…

MALICIOUS

PDF

53.0 KB Created: 2020-08-14 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 241da67a76c861bab59328539be1532a SHA-1: 7a5ba6df890829e3d48564f28d274346613b7fcd SHA-256: 4ff33c148d10591721989e5291d7d6127695e181d6b4262af28dcfcfa23e7e68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links redirects to a known malicious domain (ttraff.com), indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=precision+sheet+metal+works+pvt+ltd+tumkur
    • http://teluwofad.pickwyck.com/uploads/1/3/2/7/132712415/6940962.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://files.doodadsandfandangles.com/uploads/1/3/2/6/132680901/ronifawodizod_setupuvosukuf_wewofokodefeju.pdf
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/genegunefipiku.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/totapejasuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/ravotaxeluze.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/around_the_world_in_80_days_by_jules_verne.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/36._952746_86._513166_435_university_blvd.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/46500793830.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/bawuwururud.pdf
    • https://cdn.shopify.com/s/files/1/0434/3971/8552/files/wujanivavivodazativofok.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/lowes_watson_blvd.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/76820505853.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3671/files/94236683426.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/lomof.pdf
    • https://cdn.shopify.com/s/files/1/0436/4586/2041/files/lunemu.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_off000092fa.bin
64557fbec81a810ff16f32eda90921e64f7b4a41774406b0313662b616f232c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FA 5532 bytes
font_01_sfnt_off0000a5a9.bin
3d8dee03775c80a5c0e37b23c3905732d1b7e6e93655978c673dbf3bef01de3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A9 9664 bytes

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