Malicious PDF — malware analysis report

Static analysis result for SHA-256 08264b548b1b103a…

MALICIOUS

PDF

49.9 KB Created: 2020-08-30 13:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 525cf9b221340d272c996fa30918db37 SHA-1: 2ea1a2e7cfde7325a63d384e27299e863c58fbc9 SHA-256: 08264b548b1b103af97c7106cf995358dd015d1fe2dfcc9513283190a0334453
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for an Instagram-related tool. The ML classifier strongly indicates maliciousness, and the PDF is structured as a link farm, with the primary malicious URL pointing to a redirector that likely leads to further malicious content or malware. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or social engineering attack.

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.com/wix?keyword=instagram+%25C3%25A7alma+program%25C4%25B1+indir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/jpeg_to_gif.pdf
    • https://cdn.shopify.com/s/files/1/0439/2956/7387/files/miduketawomevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/pulmonary_hypertension_classification_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/tonedawazalesowuvivop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/98626979613.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/jowanupipiwizij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/manual_de_discipulado_cristiano.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/46399949305.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/virginia_apostille_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/63373920321.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4231/files/61922025842.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/dularepilal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/pelifafe.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_off00008040.bin
984e2cd988bfd1075a78793d650642ba5cc2d9cdc8668c63c2df02b8c23c4f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8040 5432 bytes
font_01_sfnt_off0000928c.bin
f737646d52af6ba1c3ecb3fc1a659102e9342b473b67fd37ffa89095606e8c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x928C 12352 bytes