Malicious PDF — malware analysis report

Static analysis result for SHA-256 260001060392505e…

MALICIOUS

PDF

36.0 KB Created: 2020-09-01 12:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d378ddefa0bb186eff1dae3071df287 SHA-1: 24a9ed56daff4853e7b4151d98c14293a0277e09 SHA-256: 260001060392505e4237b85f88af0f298ebcfb380b915b60c5ff35c2b894779a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm. One of the primary links, 'https://ttraff.link/wix?keyword=money+word+problems+worksheets+for+grade+2', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'money word problems worksheets for grade 2', suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=money+word+problems+worksheets+for+grade+2
    • https://static.usrfiles.com/ugd/544c7e_57fbcf354ee44f5dada1ce4aa541bce5.pdf
    • https://static.usrfiles.com/ugd/d5415a_b34bd6c7020b424f88b79ad331a0692e.pdf
    • https://static.usrfiles.com/ugd/9a242c_755bca7f81c442f8b21f024bcabc4016.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f1c2f6205f14e028ffd4927e95572bf.pdf
    • https://static.usrfiles.com/ugd/52b593_cdab9aff833348f5bdc2b42fc115abc4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/soximokavezawedufap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/48949136543.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/riwimoja.pdf
    • https://cdn.shopify.com/s/files/1/0460/1954/3199/files/jemasonigobomagid.pdf
    • https://static.usrfiles.com/ugd/b8c837_decd755ffaf740bcaa3f681a02f97f30.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6eef643ae1473992e4e40a475ccbc1.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004be5.bin
60c3b641b2577c5cd591c5c8adbf2a68ad06d4e2a2f00dab3b91f9afe89f1b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE5 5988 bytes
font_01_sfnt_off00006042.bin
7aff4fcd1af8a7148bf2f3631e5f8a5d9a77191d2702187012e7d33735544fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 10444 bytes