Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d4678160dc2e74…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 04:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47c3788a8f0d8d1d202f0a184420499e SHA-1: 5e9f9189aacfbcfbe206a24fc5844f9ca54e3a0a SHA-256: 12d4678160dc2e745b4e2ad8edb260ae117046992521ddb2e0214e29904b016c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=change+message+app+icon+android'. The document body, though heavily obfuscated, contains a similar URL, suggesting a lure to external malicious content. 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/pify?keyword=change+message+app+icon+android
    • http://poneju.karenstever.com/uploads/1/3/1/4/131407155/bojusigiluj-kusazem-fasadijijedix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/wistron_astrosphere.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/piwuvemoxaji.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9159/files/centring_work.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/31729920534.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/score_hero_hack_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/67411350551.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/puzigaweb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/rimejukavatadowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/fdmr_suraj_name_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/waweporigeluxojugomux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2548/1379/files/kambikuttan_files_download.pdf
    • https://cdn.shopify.com/s/files/1/0460/2514/6527/files/moxunajevuzufajugeled.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_off0000620d.bin
d9826100195ba9965bf7e831fbe7122aada2423c24f4a367daa21124a47c2ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 5360 bytes
font_01_sfnt_off00007410.bin
05e626c2778f47093559e8b380008e8dae5981fb5c2fb42b70e750f6f08e63a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 9308 bytes