Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c86f16605b6f37b…

MALICIOUS

PDF

43.1 KB Created: 2020-08-05 12:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c3e06460d21e624091c38387231e4ea SHA-1: a19ccf62da4a267fcc98c2bb5ed8089cccfe5b82 SHA-256: 0c86f16605b6f37bcb9cd399dd9a3e06054972ca8f14935158b66eb56fe1e48a
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, https://ttraff.ru/pify?keyword=learn+french+for+beginners+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of educational content.

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=learn+french+for+beginners+pdf
    • http://files.francais.brainintegration.net/uploads/1/3/1/4/131453494/kotuxigadumi.pdf
    • http://files.coastalkayakcharters.com/uploads/1/3/1/4/131453022/e150e.pdf
    • http://files.ccsb.danafarberdev.org/uploads/1/3/2/8/132814241/5251526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/23829238667.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/78175542849.pdf
    • https://cdn.shopify.com/s/files/1/0438/2418/5506/files/kebibuwinalovozerori.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/i_cherish_you.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofelowuloluvazoriwonub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/95380825274.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6039/files/xobugupazuvenebituzava.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/carcinogenic_substances.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/jobixewitaxavolibokik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/jumezukiberi.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_off00006acf.bin
0fbdce40d22f2c4f77216e64e035fdabebe38f29d1a789a120e840d528769349
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACF 5468 bytes
font_01_sfnt_off00007d5f.bin
9a7e7a232a3c280f66c71bb8e55597655963e3e3585a590cbaa9a3604d3638bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5F 10020 bytes