Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4f492fa665e38b…

MALICIOUS

PDF

55.1 KB Created: 2020-09-04 01:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101609f13e818958496da95486c3fc38 SHA-1: a8108dc9c84a55abf3ec04ea693f2d65e986b5fd SHA-256: 3c4f492fa665e38b55f713ecbeedc026e878ff20681957368947004dd3c866d2
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text that appears to be a lure for a journal download. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to a malicious URL for further exploitation.

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.me/wix?keyword=abituriyent+jurnali+5+2019+pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/24808446392.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/hugo_boss_blazer_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/autoclave_hirayama_hve_50.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/nixipotajaroronoponuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/1412/6759/files/60368138532.pdf
    • https://static.usrfiles.com/ugd/71fd01_fe2a046787cc43adadce94ebbe95b5c9.pdf
    • https://static.usrfiles.com/ugd/32acb1_9fcfd38f0e794302b95ae2a53ae9f429.pdf
    • https://static.usrfiles.com/ugd/95ea6b_c6d5193ee24e43d68054ec93cc21c084.pdf
    • https://static.usrfiles.com/ugd/4dded2_4a2cc3ce650f4e03b404c4dc88e9fab4.pdf
    • https://static.usrfiles.com/ugd/5ad03d_3e27d920581d46f982f1a75386e5c819.pdf
    • https://cdn.shopify.com/s/files/1/0434/4781/2248/files/tarafubovomifojawujasoles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/jetezedugewuni.pdf
    • https://cdn.shopify.com/s/files/1/0463/6629/4171/files/step_up_dance_video_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/33964931288.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/jamede.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/
    • https://cdn.shopify.com/s/files/1/0431/4628/1122

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000901b.bin
2972576949e2c2f8cfead8cc56fe98702f986adbb0245ef2256d6bd7085ca234
pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 5772 bytes
font_01_sfnt_off0000a3e6.bin
36720a6aa2f643213a18c1f4e4a466978b61c39ca702e03f182db17f73b93913
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E6 14296 bytes