Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9d7c03deaa3dc0…

MALICIOUS

PDF

34.4 KB Created: 2020-08-29 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50ac847ec3ac7794687ae20ef97a7fa SHA-1: a9f157a42127cb021c9e571d9a9fda7e77f81f85 SHA-256: dc9d7c03deaa3dc007865c7cb1ddbbda2c45a1d5d779356889a98ed431baaaae
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a PDF link farm, directing users to various shopify URLs and a suspicious redirector at ttraff.ru. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector link confirms a likely attempt to lead users to harmful content. The document body contains garbled text and a repeated malicious URL, further supporting the malicious intent.

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/wix?keyword=campbell+hausfeld+iron+force+angle+f
    • https://cdn.shopify.com/s/files/1/0434/5846/1863/files/kivix.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/hangout_apk_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/11467980525.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/gemesivetufux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/36534164632.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/97645342133.pdf
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/afto_form_244.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4301/files/99969401823.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/fonebujiduvisa.pdf
    • https://static.usrfiles.com/ugd/b8c837_55cae2a1c7bb4f87a596d1348232de55.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcd2d19f2e0347388e6efd2680f7a612.pdf
    • https://static.usrfiles.com/ugd/b8c837_b26f7a0d469e45d6a550604b79796a6e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004608.bin
3745074d7eee205ffa2cdca0678d1e0cef0f707e13c2cd07e3b90660e38ca223
pdf-font-stream PDF embedded font (sfnt) at offset 0x4608 5612 bytes
font_01_sfnt_off000058f6.bin
c39409a8eac663fc315e69a415691681630699749d7ba2f4f15bc75f7a860a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F6 10800 bytes