Malicious PDF — malware analysis report

Static analysis result for SHA-256 0492276bc1da7d37…

MALICIOUS

PDF

39.3 KB Created: 2020-09-14 10:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61b96dbb74dc0325dc43e117de255615 SHA-1: 336385cc250fa210702f5ae5c04ac4379ec43720 SHA-256: 0492276bc1da7d37fbd666dfa8ebc3c56d0058b862bb26c872b4b748665f5042
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or phishing lure, aiming to redirect users to potentially harmful sites.

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.club/wix?keyword=wii+gamecube+emulator+wad
    • http://files.klmsdrama.com/uploads/1/3/1/0/131069886/c874461c62.pdf
    • http://files.historicalsocietymaleny.com/uploads/1/3/2/6/132680808/e42f2e195e421.pdf
    • http://vafeva.circlesgr.org/uploads/1/3/1/6/131637284/wowini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/98e298_85bc06b239284e85a2f21dd1d8aedc4e.pdf
    • https://static.usrfiles.com/ugd/38eac1_ea9393badbac4eca911ad535fb4119e3.pdf
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/lenotejejexixopuvukat.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/53661051865.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/setolarozel.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/52894999624.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/tuvivafelerefis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/72694186376.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_off00005bae.bin
7ae7c0622262d79034ca6a31456ceeddf012e017fc964e1229666301536f147e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAE 5324 bytes
font_01_sfnt_off00006dcc.bin
cdedaf70ef7c213c49e04ae7ac4ecc23eabd367163a3a0621e1057a4f4ebb2f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 10356 bytes

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