Malicious PDF — malware analysis report

Static analysis result for SHA-256 677051440ebd42be…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 04:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89301ba154e4b22bea76195f0d862d2 SHA-1: 71958884e2b2261aa740cbc88d3423cc2806bfc3 SHA-256: 677051440ebd42be9994aac1841e6562b514b2851e99b30de6f7ab3e91431d41
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 external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links redirects through a known malicious redirector, ttraff.cc, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains text related to a 'fitting guide' and the malicious URL, reinforcing the lure.

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.cc/pify?keyword=coopervision+proclear+multifocal+fitting+guide
    • http://vidowekon.honeyhopfarm.com/uploads/1/3/1/4/131454549/9815901.pdf
    • http://juzaz.zshboo.org/uploads/1/3/1/4/131407406/luxuku.pdf
    • http://sosum.aimtravelco.voyagerwebsites.com/uploads/1/3/1/3/131383309/8737500.pdf
    • http://files.wbludt.com/uploads/1/3/1/4/131453278/bd5a1ea38e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/super_smash_flash_2_v0._9b.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/88974685695.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/96216748247.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3434/files/lirefomidokuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/programming_in_visual_basic_2010_bradley.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/linudilabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/anatomy_and_physiology_of_ear.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/periodic_table_crossword_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/78390509936.pdf
    • https://cdn.shopify.com/s/files/1/0437/2093/3528/files/48148833323.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/73811205142.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/55899374019.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_off000057b0.bin
46097bc5726f816fcc79dbed0f6ce527695da5700136dab119b77fd86ac7d0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x57B0 5440 bytes
font_01_sfnt_off00006a1f.bin
0529486b348be647d158adfcc406d33e73fc22741582577e9230b016bec3df11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1F 10456 bytes