Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c91c1c55b55426…

MALICIOUS

PDF

45.1 KB Created: 2020-07-28 04:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc6af20159490ed4b68d299eb98be32 SHA-1: b21cf969e86eb3f082162671cfffd3487291c4be SHA-256: c1c91c1c55b55426403aafa031777989f5052fb78c81723e998b57ab0c1494a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains text related to 'Android virus scanner app', suggesting a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm likely used for SEO poisoning or distributing further payloads.

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=android+virus+scanner+app
    • http://files.bigpineysincredibulls.com/uploads/1/3/1/0/131070872/bemus.pdf
    • http://files.randyrochefort.com/uploads/1/3/1/6/131606169/lalibozemikepovoru.pdf
    • http://files.rikahthomas.com/uploads/1/3/1/3/131384721/nijixe.pdf
    • http://files.aampmuseum.org/uploads/1/3/0/9/130969082/b27a57260829269.pdf
    • http://files.mindfulvisionaries.com/uploads/1/3/0/8/130874026/goripawolojinoj-nivesisukap-mawomobarijugip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/87973283438.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/wavozoxok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/45258146899.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/rojufok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/vuteve.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/95284042298.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/jerofiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/telesonoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/81633471534.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/48216762592.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/6906983577.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/mariwebazubelezorozib.pdf
    • https://cdn.shopify.com/s/files/1/0439/4316/6107/files/92946261627.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007437.bin
36ba4f2a97c4073e5472485a9cdb1ec8215174a41707464fb5819ff33e7d7b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 4884 bytes
font_01_sfnt_off000084d5.bin
386300570dc2e62e9dd26c7ff2823c95291888fe5ed256cbfb71291f1114bf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 10172 bytes

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