Malicious PDF — malware analysis report

Static analysis result for SHA-256 052d43cda9cb58d8…

MALICIOUS

PDF

39.1 KB Created: 2020-08-30 14:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75aae756f9d73eb82202f5d2bdfa7622 SHA-1: 47dfd14f56813e77a856fdde4031bdd656b477e9 SHA-256: 052d43cda9cb58d807edccdbcb051522fdf24a6e16d99b3246df1a807d6ad743
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure. 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.ru/wix?keyword=qualcomm+mcp200+user+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0866/9334/files/biomerieux_vitek_2_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/gipabepopap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/atf_box_latest_setup_12._80_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/ceramica_marajoara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/nanatixome.pdf
    • https://static.usrfiles.com/ugd/599026_1a4aafb91fb84cdaabc3017f5b220873.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/46569014530.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/vazopujovurede.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/malusezajiwukurod.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/arm_cortex_m0cortex_m0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f3a30c779d64caa82f7c8d520bb5d73.pdf
    • https://static.usrfiles.com/ugd/50de67_d7c82c07e69c44b39391019b6fe4fa9c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bea.bin
3bf03d004c34da6cd010f3711c96f1d82708bfef71a52e3c5a96491a1a2adaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BEA 4244 bytes
font_01_sfnt_off00005afe.bin
1a5888863f625372d5d9c515224f044546f92e986db54ed1b02b8d56a4b1c4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFE 5412 bytes
font_02_sfnt_off00006d49.bin
edf0e4c4e4623bfa4c23d0a7cd021da13b7f21299c5679627e442d7feb42b9d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 10140 bytes