Malicious PDF — malware analysis report

Static analysis result for SHA-256 104135045d7f6ba0…

MALICIOUS

PDF

41.0 KB Created: 2020-08-18 17:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c216e3fe3f4c1d85552fcd4b6a553af SHA-1: 522341a1bee719adff4702fef2dfd18e49af45b1 SHA-256: 104135045d7f6ba0628df43ec0e4b1cc45de1cb8ec1f418806166cf3d0f46556
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF files hosted on Shopify and other domains, with a primary redirector URL identified as malicious. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a lure. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate a phishing or scam attempt.

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=answer+protaper+20%252F+20
    • http://files.chloe-bee.com/uploads/1/3/1/0/131070894/1972206.pdf
    • http://files.footballsnapbacks.com/uploads/1/3/1/4/131438439/2272731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/2158/5831/files/jiwefudosuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/13649305976.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/97826419293.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/69398579811.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/23427389749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/fezokudulatawawemopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/lavodetarikeraxigofuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/konurapu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/dukegirefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3030/files/vekagabezixirijukarevizi.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_off00005abf.bin
4dd3d88334054d44f3af0e9dae830a91138c5e3dfc48977b336c988709f2c58c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABF 5172 bytes
font_01_sfnt_off00006c79.bin
9bbf63a75d608b2bb099d765f2d9d5c9a180322efae99bfd5c135af6504c63a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 13724 bytes