Malicious PDF — malware analysis report

Static analysis result for SHA-256 601f325b446082b3…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 10:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1674b45cbc62c22d36e3c1db480011 SHA-1: 492d3dbda653b744a070a9b63c55b14141ce7725 SHA-256: 601f325b446082b3ea90ec76b74a265e3199377573a04261b0736b228a5444d7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to psychological questions. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

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.me/wix?keyword=geli%25C5%259Fim+psikoloji+sorular%25C4%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ba2ad8aab49f4d098695ec919d7a9c1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_99e6f045551b4c788ab72ae5de9f1672.pdf
    • https://static.usrfiles.com/ugd/9421c8_bfe7fdb8460447a59af20c469cd3b82c.pdf
    • https://static.usrfiles.com/ugd/cac9e4_d726a7540f2549f1ae0d72fbe53ff79c.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_cdd309938d274e70997c5c48375b20b1.pdf
    • https://static.usrfiles.com/ugd/e8506d_f5a71bd38dc046868d9a8b4bf99f267f.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/nowor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/mitesafikimumikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/73801881330.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/nukaxuxefarizonorazufa.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_off00005d7d.bin
99bfe0e065432cc817f9f040dc92ebee1698d8754c4c4b6429468acfc6a09da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7D 5416 bytes
font_01_sfnt_off00006f64.bin
11a13553cc46eb2949f79f112b152f80993d30430b3f72bc55400aad45097389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 11432 bytes

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