Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48f842fa4c2b439…

MALICIOUS

PDF

48.7 KB Created: 2020-08-14 22:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8cd70ca7a5a1c02ff958d48be5533f SHA-1: abd3a7ba4b6fa1f80d92124e42266ab38b455996 SHA-256: b48f842fa4c2b43955c92d9d7f8b6e2647d5283aed60f8eea0b97e19e777dd7e
152 Risk Score

Malware Insights

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

The PDF contains a deceptive title and a link that redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness. The primary malicious URL is ttraff.ru, which is used as a redirector. The document body, though heavily obfuscated, contains the same lure text and URLs as observed in the heuristics.

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/wb?keyword=south%20african%20romantic%20novels%20pdf%20download
    • http://vatedab.artcellarcr.com/uploads/1/3/0/9/130969060/wusobozu-silenedebiji-tarutuxazekagad-kegatakeromujo.pdf
    • http://roxisi.thesauceguys14.com/uploads/1/3/1/4/131454106/wiliviwarinopuzupo.pdf
    • http://jujififa.harrillconstructioninc.com/uploads/1/3/0/7/130775350/c4a6ead08616d.pdf
    • http://wukof.metrolifesafety.com/uploads/1/3/2/7/132740961/dfbdb.pdf
    • http://zuwaxisam.nogasplant.com/uploads/1/3/0/7/130739678/a60dd2827898c.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/sukogamelezatotidokut.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8302/files/rasujesiwaxazanujes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7607/6188/files/42781389911.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/90890920038.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/67725458794.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/asme_pump_standards.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2613/files/compare_strings_java.pdf
    • https://cdn.shopify.com/s/files/1/0452/6519/1073/files/26505230714.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/65524839162.pdf
    • https://cdn.shopify.com/s/files/1/0432/8833/0396/files/fomibunuvejinigazirubeki.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4656/files/case_study_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0428/2109/1484/files/32484348188.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_off000068b1.bin
be32419804095a0c0c674d8ea2ea76e8b8de4ea9716e0fb2f117dacc26145722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B1 5652 bytes
font_01_sfnt_off00007bcc.bin
3b32d152a48a852144f992c868a3ae8991f5314ecb8e5367b5f17153008f2d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCC 10476 bytes
font_02_sfnt_off00009fdd.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDD 16092 bytes

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