Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c91c3ede8ae230…

MALICIOUS

PDF

42.1 KB Created: 2020-08-16 22:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79cb8805a663dbad3b26b54a3f9f057 SHA-1: feb5e39bc9a90f71b0276e2b6e0cd6aa23354c8b SHA-256: 62c91c3ede8ae230915a0afd0d797ca409a131490d50116e9ebde59cd65ecd9c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=cardinal+newman+sixth+form+college+brighton'. The document body also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic. While no scripts were extracted, the malicious redirector URL is a high-priority IOC.

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=cardinal+newman+sixth+form+college+brighton
    • http://files.insectnavigation.com/uploads/1/3/0/7/130775331/pukesijaf-pufigerifiw.pdf
    • http://files.sunlightchaser.com/uploads/1/3/0/8/130813546/zilexep.pdf
    • http://files.therocksm.org/uploads/1/3/2/3/132303351/tilapajexarosiwizad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/pedafumipebaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0586/files/common_stocks_and_uncommon_profits_and_other_writings.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95181885481.pdf
    • https://cdn.shopify.com/s/files/1/0434/9473/6037/files/jejotodubumexedusenoxapuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/jobanelopewawaxefuri.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9190/files/rudasekoxan.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/factorial_in_mips.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52945462890.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/25021274888.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005645.bin
278f9c313faeaa8e762469bafe74615837e7a47fa32a2ac22aac245bebea5c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5645 5544 bytes
font_01_sfnt_off0000690a.bin
53df3f504f8a81cf13171254d432ee1dc1b76507ce6b5f99a5582ec937add52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 10672 bytes
font_02_sfnt_off00008d86.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D86 4324 bytes

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