Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7269afe114c4f7…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a3a16864b63b41e4d89fea35a63fc5 SHA-1: 7ac468b5f2b4f0fa3d850f0e8862a6dc7171cc22 SHA-256: 0c7269afe114c4f74937497884f3618d1e7ca64a5a7af156c1e0df7ce25ba5fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though corrupted, suggests a lure related to 'interview questions on cloud computing pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute payloads. 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=interview+questions+on+cloud+computing+pdf
    • http://jaradazig.tiffanylynnengler.com/uploads/1/3/1/3/131384635/dac842.pdf
    • http://files.chatswooddensitometry.com.au/uploads/1/3/0/9/130969966/5792248.pdf
    • http://bogilowi.career-readiness.com/uploads/1/3/1/4/131437423/bifeborebuwazin_zugimowinagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/99996512338.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/13278449344.pdf
    • https://cdn.shopify.com/s/files/1/0443/5856/6044/files/arrows_structures_and_functors_the_categorical_imperative.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/small_scale_broiler_production.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/free_piano_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/47559814868.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/les_types_de_centrales_lectriques.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/81791695986.pdf
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/sodedesidiji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/500_academic_word_list.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_off000064ca.bin
9ce3b33ec611db18813b0a4a7229bc2b469dca982e7f72aae03a0cf76b6e0eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CA 5480 bytes
font_01_sfnt_off00007771.bin
58b97c034027ee158a2751fdb4497ef7957456fca8f227746f1f246133811bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7771 10896 bytes