Malicious PDF — malware analysis report

Static analysis result for SHA-256 926123bc7cdf6d09…

MALICIOUS

PDF

66.8 KB Created: 2020-08-08 21:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb745513182bbe8052d9bc6809b1247 SHA-1: 6cd479685a58dc211d7d9974756739995d49c2fa SHA-256: 926123bc7cdf6d09a3ff9e9eddcb18e710415a3aa79e33ac6925c424df424b10
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=absorcion+de+vitaminas+y+minerales+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, including one hosted on 'cdn.shopify.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL as the redirector, suggesting the primary intent is to direct users to malicious infrastructure.

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=absorcion+de+vitaminas+y+minerales+pdf
    • http://files.stayinlaos.com/uploads/1/3/0/7/130776049/2661911.pdf
    • http://files.johnscreekchorus.com/uploads/1/3/2/6/132682204/nalewuvijuj.pdf
    • http://files.earthdaykid.com/uploads/1/3/0/9/130969235/3e4fb1d757ca7f.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/ragilefutogalopuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/35691032455.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0999/files/dixakelawuxolebivoteza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/lujobupa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/network_cable_types.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/tojil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/josugoxibosok.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/lodudewovalesagolefezelap.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/36862408496.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/sigefulewutuzibewojexota.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_off0000c53d.bin
0f0b2d684bad33ca794938d45b6be85d9e2b7cc74fb6dc0fb48113b356171b37
pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 5592 bytes
font_01_sfnt_off0000d839.bin
5011c311cba5c9a3ee79e612de925c3eebed7794b186adf945ee73e64e4fcd9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 11140 bytes