Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b991ef9b60579…

MALICIOUS

PDF

42.5 KB Created: 2020-08-20 08:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305f31af8a3ebf9392f9c251a56ade50 SHA-1: deea203a291ad77dae84268cb5ecdf564d5335db SHA-256: 5c6b991ef9b605790a53b96eb0e8038a279e8d7ea00d072ca9eba5e7ec86d003
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL that leads to the malicious redirector, suggesting a lure to a phishing or scam page. The presence of many external links, including benign ones, indicates a link farm strategy to potentially improve SEO for malicious content or to distribute payloads.

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.ru/pify?keyword=arizona+state+university+application+form
    • http://files.alanbazin.com/uploads/1/3/0/9/130969762/wexubewofumosadeta.pdf
    • http://files.shineforfiveboutique.net/uploads/1/3/1/1/131163898/7639e0c67378e8a.pdf
    • http://files.woodworkslexington.com/uploads/1/3/2/6/132681772/lapiwig-lemurivelitaro-revapero-mukatomudugeluz.pdf
    • http://files.rijkewijnen.nl/uploads/1/3/1/8/131871488/8222942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/2723/4722/files/bezeragoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/fazopod.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/94415969138.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/52801492908.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8643/files/matricom_g_pad_ex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/lezafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5343/9383/files/25022247891.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/crise_argentina_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/26755149975.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/all_accounting_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0463/7822/1729/files/dieta_atkins_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/pudofovabefuv.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_off0000666f.bin
99f789fe705ef2865cb3061388c6695af2fb591a8b5133ce428d70d8e151aaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 5360 bytes
font_01_sfnt_off000078a7.bin
936ad87238e7cf40fcc8c74723dc15ab0c747c5e0fe5f8838e0ddff9a3525a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10636 bytes

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