Malicious PDF — malware analysis report

Static analysis result for SHA-256 5211a5c3bd2125b2…

MALICIOUS

PDF

41.9 KB Created: 2020-09-03 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec91ed3083b0316b6cd7d2cc20731dd4 SHA-1: ac7c5ef44790fb140307b4306f71cdcc5597942b SHA-256: 5211a5c3bd2125b2523503ca89356cf0615743305c6a554df01522b4d122fa52
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious lures. 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.com/wix?keyword=icloud+id+finder++free
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/83392374307.pdf
    • https://cdn.shopify.com/s/files/1/0452/2465/7056/files/test_de_apgar_enfermeria.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/88721515862.pdf
    • https://static.usrfiles.com/ugd/253000_4bf6db6e734f4a33a9c3e2a03d67226a.pdf
    • https://static.usrfiles.com/ugd/9421c8_0fe356d897ec410c8fca50fce17de819.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/tao_tao_150_cc_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3798/1852/files/analytical_method_validation_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/gezasixof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/37008783396.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/central_de_incendio_honeywell_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/lofoxepaxutesusowil.pdf
    • https://cdn.shopify.com/s/files/1/0468/0312/4375/files/deferiborefefuseleb.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_off000067fc.bin
f1a1756d8b01c8cf8f3cfd91cfc520946480d1d2d511f96ec290cffbc47442c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 4564 bytes
font_01_sfnt_off00007791.bin
764043001135029ecd35e4e9f18729d2373ba2aeb55f6d1630002983b0d7bd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 10364 bytes