Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fb159f1d86792f…

MALICIOUS

PDF

36.8 KB Created: 2020-07-27 15:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2459820214818c862ea18af61f7c9b2b SHA-1: 790160a0f7ef1669e5b1a778560344b6007cc904 SHA-256: 64fb159f1d86792f4bfe728344a7f0b83af9ca3dcc02aeefca8dff6a1a5aa923
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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.cc/pify?keyword=capitalize+book+titles+worksheet
    • http://files.lovephukettours.com/uploads/1/3/2/6/132681694/ligebezupekona-jaregizab-biwupe.pdf
    • http://files.scenealongtheway.com/uploads/1/3/1/4/131438211/rabevap_totowibinug.pdf
    • http://files.tomnet-utc.org/uploads/1/3/1/3/131379718/1792138.pdf
    • http://files.skyleblanc.com/uploads/1/3/1/6/131637034/sabosutukitikusuwiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/1107588628.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/99151915959.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/52674400889.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/17874929030.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/fijof.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/ranisub.pdf
    • https://cdn.shopify.com/s/files/1/0438/0295/1842/files/68075609359.pdf
    • https://cdn.shopify.com/s/files/1/0434/1147/2541/files/sujiwigubipogerezamoxarim.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/25257494816.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/93367034497.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/69644474086.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_off0000541e.bin
e9b5cdb48bd23fc6e3124abc0b6fc8d935d0cd09721267cb50dd5284fe83b2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x541E 4956 bytes
font_01_sfnt_off00006521.bin
e574a638e44ca9dabccb00c27256535511c17a04f0747194c0909b3bd019603e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 9620 bytes