Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccec432a2e8a1210…

MALICIOUS

PDF

50.5 KB Created: 2020-09-09 04:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda4e9f397b9a7fd7a6cc1c98ab87599 SHA-1: 863a1bb686574ac7aa20f5470631f15b3246cf48 SHA-256: ccec432a2e8a121014abf7f098fbd618c3899c3156ce7c4d0aa4e41fb92e7ffd
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure, and another indicated a mass external PDF link farm. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=home+architecture+design+software', which is likely the primary lure. The presence of many links suggests an attempt to manipulate search engine results or distribute further malicious content.

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.link/wix?keyword=home+architecture+design+software
    • https://static.usrfiles.com/ugd/34ec99_33698e3a5ca94eeeb709387ea5bcb655.pdf
    • https://static.usrfiles.com/ugd/dcfb95_88400414ef3e4ee38bad6c83d6f6449a.pdf
    • https://static.usrfiles.com/ugd/c1c462_649c3afdf9634d3fbb5141b6ec7725bf.pdf
    • https://static.usrfiles.com/ugd/041b56_dd41a6577dc94399bebb9c1c8d1ca168.pdf
    • https://static.usrfiles.com/ugd/3be3a7_b705228a42fd43b9b92f44e1e3b2aa0d.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5712/files/aluminum_wall_cladding_details.pdf
    • https://cdn.shopify.com/s/files/1/0439/0155/0760/files/zebigixowavowajowex.pdf
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/saloxexusudoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/supabolomavovurosulat.pdf
    • https://static.usrfiles.com/ugd/cec570_f0394fb784154b9fa940beacae5b8c34.pdf
    • https://static.usrfiles.com/ugd/a72fa8_2a3fc0646a234aacb7f009c6246ab0e8.pdf
    • https://static.usrfiles.com/ugd/96bf9d_05019e1ce3d44770b3ce8172838ba58b.pdf
    • https://static.usrfiles.com/ugd/948cea_75f3ae4e747f42c997abd8c21b07bd86.pdf
    • https://static.usrfiles.com/ugd/b8c837_92a4832656354b65b2cbacacce3e4a7e.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/46296401847.pdf
    • https://cdn.shopify.com/s/files/1/0448/4985/6669/files/sindrome_amnesico_organico.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://static.usrfiles.com/ugd/cec570_f0394fb784

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087ac.bin
348d20ea27cd934d488b96d0e3dcabf25c70d25175d932cd818a2727b00adc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87AC 5456 bytes
font_01_sfnt_off00009a19.bin
15a4e3fe221fb3747d8835ead038746831ee3140afc5e234daa9a7ddba6184ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A19 10152 bytes

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