Malicious PDF — malware analysis report

Static analysis result for SHA-256 77212d72bd27aaa1…

MALICIOUS

PDF

43.4 KB Created: 2020-09-26 12:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8998c81d1ebca1d97ca747e78cd0369e SHA-1: 9264ba7419f98564f3a1e22ac5025bda9a3c791d SHA-256: 77212d72bd27aaa1aebac94f3326a4976383d55f04f34a1be22755751285c812
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. Several heuristics indicate it functions as a link farm, directing users to potentially malicious or SEO-spam related content. One prominent URL, https://ttraff.ru/wb?keyword=lego%20star%20wars%20the%20complete%20saga%20apk%20obb, appears to be a redirector, further suggesting a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.ru/wb?keyword=lego%20star%20wars%20the%20complete%20saga%20apk%20obb
    • http://tepalafi.jenniferwleighton.com/uploads/1/3/1/4/131453943/wudidutizubobur-genosub-pefiditokugamom-zofofopozisi.pdf
    • http://kabegafod.northvicgps.com/uploads/1/3/0/7/130740117/nuwuz.pdf
    • http://files.richardgoldsworthy.org/uploads/1/3/1/3/131397946/ee59fda990ae.pdf
    • http://fibazo.marketplaceinternational.org/uploads/1/3/0/7/130740597/72d014ba4f1e.pdf
    • http://files.tfmusicparents.com/uploads/1/3/0/7/130739202/ca0ea1c4bc34.pdf
    • http://files.caramelcreams.com/uploads/1/3/1/1/131164033/edec422.pdf
    • http://files.neverwares.ca/uploads/1/3/0/7/130776081/3830b7bb8.pdf
    • http://xuvelozu.southcentralsetac.com/uploads/1/3/1/3/131384609/bf8daf789c448c.pdf
    • http://files.priscillawakefield.uk/uploads/1/3/1/1/131163872/jifoxun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/soluciones_al_cambio_climatico.pdf
    • https://cdn.shopify.com/s/files/1/0438/3794/8061/files/border_collie_corgi_mix_information.pdf
    • https://cdn.shopify.com/s/files/1/0450/9813/9813/files/jawufodasekiwinaper.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_off00006746.bin
81c419f4fa687ebd774b781f2df7a16c21ba932a59874487b1f7ac90e017c3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 5584 bytes
font_01_sfnt_off00007a33.bin
93dabaf1e91f0fca43f473d8c80c2966356ca2721b3d743ebe8356cfde0feabc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A33 10772 bytes