Malicious PDF — malware analysis report

Static analysis result for SHA-256 842d14ea43a2a9bb…

MALICIOUS

PDF

41.4 KB Created: 2020-08-19 10:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3791b389dba5ae8b3ecfc654719cff34 SHA-1: 4651942a1b878070e22aa75a323855dc2d080dba SHA-256: 842d14ea43a2a9bba5a968fdcf46b613763e4f11238e24385b9c424af78e9c95
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing 'whistleblowing journal pdf' and includes the malicious URL. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=whistleblowing+journal+pdf
    • http://fufenax.yourhealthdojo.com/uploads/1/3/1/6/131606758/3101806.pdf
    • http://files.htciaconference.org/uploads/1/3/1/4/131438069/7636155.pdf
    • http://files.rendonmediation.com/uploads/1/3/1/4/131408353/tovafozetudujujabute.pdf
    • http://files.emporiaflyingclub.org/uploads/1/3/0/7/130775974/c6054e.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/13026459606.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3171/files/4589072327.pdf
    • https://cdn.shopify.com/s/files/1/0445/8476/3556/files/apset_computer_science_previous_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2304/8610/files/cat_s_cradle_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/facebook_android_app_minimum_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/bowokegarekirajamuseza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/14313375729.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/customer_centric_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/biosynthesis_of_proteins.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/xotipugikoloziridukomafub.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_off000063da.bin
14f9ccd069035d18bca7b694658ab7fa6b578c6f292c94f1162504f116434b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 5624 bytes
font_01_sfnt_off00007701.bin
412027393dfe436a3bfd171ebbbf3a571f391c2aa39a16996c8e3d8490182223
pdf-font-stream PDF embedded font (sfnt) at offset 0x7701 9960 bytes