Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143de0a8323d4e0…

MALICIOUS

PDF

36.4 KB Created: 2020-09-07 06:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d680cb09d42626c84aa7e00bd69b7f SHA-1: d8d78d636b05a4546fb64ee62c372c7e19813b10 SHA-256: 7143de0a8323d4e003b14ee3ae324e9907b4be5e28a449dcaa89d8862529dc8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=alaipayuthey+movie+video+songs+with+lyrics'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=alaipayuthey+movie+video+songs+with+lyrics
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/98754059115.pdf
    • https://cdn.shopify.com/s/files/1/0437/8696/1045/files/android_auto_icona_whatsapp.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/1366980475.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/pomurigesoworetape.pdf
    • https://static.usrfiles.com/ugd/704566_9b6ce8a9a8774ac2844a9bd18efa2b6b.pdf
    • https://static.usrfiles.com/ugd/9904c2_7f3019bbc2074263bb5e779231a50401.pdf
    • https://static.usrfiles.com/ugd/fbccce_528d1ab793c44747adf1876d4b407448.pdf
    • https://static.usrfiles.com/ugd/cf5aa9_758286ae61264f4eb828619e3034bb27.pdf
    • https://static.usrfiles.com/ugd/3b47cb_54304e640e4544e6906f376d0eb53cc4.pdf
    • https://static.usrfiles.com/ugd/6a22cb_77f38975b00b4d28bec0ad87cba32066.pdf
    • https://static.usrfiles.com/ugd/6908d7_17c3e66789da4b05a6e2051a88229c8b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3863/files/heinz_spaghetti_bolognese_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/7854/9665/files/sogusukik.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_off00004ff8.bin
e2e23c93e9919a7622279efb90ec47ad9dfc3f269fc72bf7bdbf955d8ed1ec4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF8 5728 bytes
font_01_sfnt_off0000636b.bin
58bbd575c55474bb27e47982968a7cc77598fb74638ba9628027a53fc5cc453d
pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 10096 bytes