Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c2b198b251fb24…

MALICIOUS

PDF

34.4 KB Created: 2020-08-29 18:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b112d6586ee8f167e6befe7c96eacc SHA-1: 9cf9d9144e9ba49013dbe421a72db0731b2ac5aa SHA-256: 13c2b198b251fb24b1aabe67abd44c88d7652cab4b9035d1763154189470e2f2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs. This suggests a tactic to drive traffic to malicious sites, potentially for phishing or SEO abuse.

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/wix?keyword=beckmann+obstetrics+and+gynecology+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d5604d5f2d7741efba6f247756932ddc.pdf
    • https://static.usrfiles.com/ugd/b8c837_946e224b9e224da3ba33e5d7e7495b8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c88282e13b6a46a68ea9a93f5f940567.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_6ea227b0685a4a89ba1187938dd52fe0.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f9a4d82f97df47b98b6558ffce61cf12.pdf
    • https://static.usrfiles.com/ugd/e745be_c2701613aa9c40f3ae9833f6198239b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc315ba13a37423eb33f7e721aefa94c.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/89183169132.pdf
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/bose_soundtouch_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/58129484545.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ed20c09f354843eb833f8e90838abd4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b732ad22ae3410e89ffb1f879cbb5d0.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_off000048ba.bin
b40e6c4051453c347c23c9383054f0b46587aaf50d35efab796286742191fcd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x48BA 5696 bytes
font_01_sfnt_off00005c0a.bin
1eac121ab52962553b971cce0f8a94da08a99b8a32f9aa88aafadb4bdc32ff30
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0A 9600 bytes