Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35d2c30fd63e3c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-22 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7f29e9cbc41da272593d6b34d7a473 SHA-1: 0c77f5f0a0fde0c313207cd05520d8739bd83884 SHA-256: 3f35d2c30fd63e3cb5742a20b28e1ab773048307a6a3d900a5a0cc3a84805c34
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. 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.cc/pify?keyword=barrett%2527+s+esophagus+diet+guidelines
    • http://sokera.mountainfresh.org/uploads/1/3/1/1/131164250/4244717.pdf
    • http://rinideb.brisafinancial.com/uploads/1/3/2/8/132816066/7caeb827eb05744.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/tactics_for_toeic.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/83432901586.pdf
    • https://cdn.shopify.com/s/files/1/0428/9481/9484/files/basilivakabobasene.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/solapur_university_result_2020_b._com.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/bobigukuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/95222558587.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/ravusajemisadokutufalaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vukanuzedatijaxugevune.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/maxasagopol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/vepugelirakivegamavufuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/liluwebirarelisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.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_off00006199.bin
8795e85824b804489db2a6a8591678c978b2b7c2da5db26572fd89ab3c69ca29
pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 5304 bytes
font_01_sfnt_off000073a1.bin
ce615769ec0a19b188414d1589350a20cdd314c91ef49663ac9fa2274ae9b146
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A1 10312 bytes