Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca35fbc89d4a71d…

MALICIOUS

PDF

43.1 KB Created: 2020-08-01 05:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed64300c57c6e3346ce698dea8df7808 SHA-1: f331758f32698bbe3712aaa0e20c50e332c1c79a SHA-256: aca35fbc89d4a71df89c55326f6f3bfacd29a9b8e39d71329110fcd4f1122a73
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=osrs+the+slug+menace', points to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted from this sample.

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.ru/pify?keyword=osrs+the+slug+menace
    • http://files.bakersville.com/uploads/1/3/0/7/130775257/kosukelavo.pdf
    • http://files.cecco2go.com/uploads/1/3/1/4/131406505/8120577.pdf
    • http://files.deanclaytonedwards.com/uploads/1/3/0/9/130968996/fimizukir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/12394977833.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/vifatuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/zupeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/vupigowalivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/mijelarew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/sukupukinelifafudugawuxuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/59305176611.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/60086341739.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/44799387496.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/70104760721.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/11520486293.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/vulaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/noun_clauses_worksheets_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/joker_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/81053316346.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_off00006c02.bin
b9ce329c458270eda192f431b9e06d46fccb9a65c288dcaaaef071a93017665a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C02 5240 bytes
font_01_sfnt_off00007da5.bin
12ae428d9f6020aa47911cf3677e146ec2c0b6c332a2d2baa644f34cc8b0aa77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 9956 bytes