Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a98dc4b3acb646…

MALICIOUS

PDF

44.6 KB Created: 2020-09-01 02:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de26ab23407093fcf0ae8d4b2e46c1e3 SHA-1: 0a05908edc03f933e89f36f8eaff56bfed4b8ae2 SHA-256: a6a98dc4b3acb646d0207b60818b230d92d80eccc9952505dc0cc7c78ac0ffe8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=guide+critiquing+photographs' which is flagged as malicious. The presence of numerous external links suggests a link farm or redirection strategy 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.ru/wix?keyword=guide+critiquing+photographs
    • https://cdn.shopify.com/s/files/1/0435/2488/2583/files/blaise_cendrars_el_oro.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/page_417_big_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/zesenamabipalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/banking_service_chronicle.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/2010_dodge_challenger_v6_performance_upgrades.pdf
    • https://static.usrfiles.com/ugd/122077_d936884e21ca4da4b43760299a254a27.pdf
    • https://static.usrfiles.com/ugd/b52961_4eed404933b944dbb4c3938c13e28eac.pdf
    • https://static.usrfiles.com/ugd/3aee12_89fe9f99fef44e0dafc9c2bfd12f05ac.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/domapotogagexafinomam.pdf
    • https://cdn.shopify.com/s/files/1/0429/2437/6227/files/minecraft_pe_walls_servers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/51620648977.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/vujokelapubuxuxotipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/biography_of_abraham_lincoln_in_english.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_off00007202.bin
88f2df2e3a5370cec634a11c66b77639640cb6fe5f41bd9a5c37cbabe5687a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7202 5460 bytes
font_01_sfnt_off00008481.bin
f11a244f644ac137e577b358bb65bb90243f569f650a5911c7c5315cb68d5d2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8481 9604 bytes