Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fe3174360ecb9a…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 19:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50d3009a7e3021a0181fbc6cd6d7b897 SHA-1: caeab4b75ee60321935272c5bb6ff74c2386d83f SHA-256: 02fe3174360ecb9a38726ecad20088846702c80d66c74baa9c2f007f1e405710
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a redirector service, which is a common tactic for distributing malware or phishing pages. The document body text, though partially corrupted, suggests a lure related to 'client service associate interview answers'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content. 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/pify?keyword=client+service+associate+interview+answers
    • http://files.mrhso.org/uploads/1/3/0/7/130738559/b04139ca976590.pdf
    • http://files.lumacomi-observatory.com/uploads/1/3/0/7/130776268/gevozoras-kexif-difowuxagomuk-juraxekofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/faxiwun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/detujake.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/79849780770.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/16261170985.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/precalculus_with_limits_1st_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/gantt_chart_template_project_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/17215300995.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/zojakutiludir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/tokatoxatimot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/the_canterbury_tales_middle_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/17117057474.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffe.bin
e7770039c15604819288bff82a871ffd345c66ee9fe74e906254abf0b12fe027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 4852 bytes
font_01_sfnt_off0000709c.bin
dfffddda047a04d9ac53eafa603e11b15493e308d282a2781f0a4112dd263aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709C 10052 bytes

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