Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ef1fb4840a7865…

MALICIOUS

PDF

41.7 KB Created: 2020-08-15 16:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde588023e502b33bd30325c9f33171a SHA-1: f8e3498ed78a6d7e0af1e4efeb076f9a92e6ce01 SHA-256: d9ef1fb4840a7865527d192cc5e00ff04ca2494a7a30f943a7c2b9c037c18f99
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, one of which is a redirector. The document body itself is heavily obfuscated but contains the URL 'https://ttraff.cc/pify?keyword=crs+reporting+format', which is likely used to redirect the user to a malicious destination.

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=crs+reporting+format
    • http://files.ashlandday.com/uploads/1/3/1/4/131437982/584671.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/befiver.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/newesipodetujuzelogige.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/81638265983.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/mipekukoxanekerudomiloduw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/dejofojinibosoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/dopeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/82761238156.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/24683876089.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_off0000665f.bin
32d20763d7a4c82527270921aaf58f4945d0124803a4d29b2f4d0719105b5d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665F 5096 bytes
font_01_sfnt_off00007798.bin
9393c8af96dba08eee30aee4347fbee75b22f619d1f2e86b31e4d5478be995ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7798 10220 bytes

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