Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0a95adcc560bb…

MALICIOUS

PDF

52.5 KB Created: 2020-09-11 01:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f466a5a9db15785af8bc43439f5f6f SHA-1: cfbb261a54faefbc180e96bda065cc532ccd2729 SHA-256: ccf0a95adcc560bb73f68a1d14f18ba42af73d0f741da2e7507978eb952631ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/pify?keyword=tamil+god+amman+devotional+songs+free'. This URL is embedded within the document body, which also contains garbled text alongside the link and several other PDF links. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm heuristic further suggests a malicious intent to distribute links, likely for SEO poisoning or to lead users to malicious 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/pify?keyword=tamil+god+amman+devotional+songs+free
    • http://xakirule.saillab.net/uploads/1/3/0/7/130775755/jalenozoba.pdf
    • http://kikub.karenlabeau.com/uploads/1/3/1/0/131070197/risajigotati_monowizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3607/4396/files/chapter_27_to_kill_a_mockingbird.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/warm_autoimmune_hemolytic_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/wozojuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/histogram_equalization_python.pdf
    • https://cdn.shopify.com/s/files/1/0435/2488/2583/files/78329356305.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/faraja.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9501/files/32963855117.pdf
    • https://static.usrfiles.com/ugd/a72fa8_90ff9411a58546c3b7b3cadf69c2a984.pdf
    • https://static.usrfiles.com/ugd/92ee2b_0d14140b1bb8408ba20b7f3113c63766.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef0.bin
d222245bf4530fb2735c15984bc32893a4dfbb8c17b2e2b90bd3aa0136eb2aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 5024 bytes
font_01_sfnt_off00006feb.bin
17f14a9b5a2c2ad48d051caeeaef215bc3b5a3b1ca58e76ea8edc4da84ae070c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEB 10376 bytes
font_02_sfnt_off00008b6b.bin
c5c7a3ed1656529e5f743cd166bd378b7079455186fdc09a2e474ef913d74375
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 13980 bytes
font_03_sfnt_off0000b6b1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 4324 bytes