Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b905d444ddd3f3c…

MALICIOUS

PDF

37.6 KB Created: 2020-08-15 03:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f21eec5cf4c844346cdc812dd88bf46 SHA-1: 5a46946e0a17b5981c3d289d4736bf811ae2c643 SHA-256: 2b905d444ddd3f3c15c3533bb9ce5aaefe8500e22bdd8b1a77ec7664fd663ff9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains numerous embedded links, a common tactic for redirecting users to malicious sites. The primary malicious link, 'https://ttraff.cc/pify?keyword=letter+y+phonics+worksheets', is identified as a redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on Shopify, suggesting a link farm or content-luring strategy. The ML classifier strongly flagged this PDF as malicious.

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=letter+y+phonics+worksheets
    • http://sagavobik.prospectfarmvt.com/uploads/1/3/0/8/130814328/80f7a.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/xevaxesibu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/concerning_hobbits_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/65567363846.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/atlas_of_amputations.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/88742698253.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/57087571876.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/nojop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8986/1535/files/list_of_root_words_in_english_with_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/gopoxegeveraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/mudin.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/95424220000.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/wisab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/5045037968.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a0f.bin
1bb3d76851dca71fb3342607c22da0026cbf26556bbe4c6da838f3e95e3de9eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0F 4768 bytes
font_01_sfnt_off00005a4f.bin
79c934cba7ff140e009139f666c2b83cec512d18a69e287f156828bc7bf8a70c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4F 9640 bytes
font_02_sfnt_off00007b63.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B63 4324 bytes