Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaa4173aa01b7cb…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 15:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddeb80e0244915a85a445a238b2d07cb SHA-1: db43370c05d8a51dd911d1aaf5c35fb981fc5007 SHA-256: bfaa4173aa01b7cbabcd0bea0c66be9c22526fd7b712f3afb5820212962cbf72
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=obtain+police+report'. This URL is presented within the document body, suggesting a social engineering lure to obtain a police report. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely for obfuscation or to appear legitimate. The ML classifier strongly flagged this PDF as malicious.

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=obtain+police+report
    • http://files.jakemasritattoo.com/uploads/1/3/1/4/131437471/fece6323.pdf
    • http://files.desiraeogden.com/uploads/1/3/1/4/131453855/puwamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/75054124163.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/12712475055.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/maronelu.pdf
    • https://cdn.shopify.com/s/files/1/0448/5169/1681/files/diet_for_o_positive_blood_type_to_lose_weight.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4192/files/adding_and_subtracting_fractions_worksheets_with_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/accessibility_insights_for_web.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/duzarimimenusudotafitad.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/jazogizelakafime.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/gulizewakojazawoxewibenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/liste_d_adjectifs_descriptifs.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_off00005f67.bin
636d18e962f8e7fc3effcfba22747bc0eb38e62519d9cca744e116de033b58c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 4916 bytes
font_01_sfnt_off00007025.bin
40fc497dbe631c3a86c5a04a8b5f5cfefa179d00a5f2dadfda7af937490a3060
pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 10164 bytes