Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c71a1e738f8809…

MALICIOUS

PDF

70.8 KB Created: 2020-08-10 07:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2cbb664afd9e55ebf200d64ab985c6 SHA-1: 2111ceacf7cb7b48e1eb5bc3feaea6c5b64d66f3 SHA-256: 98c71a1e738f88090e04f7609d3023957036456db87dbc9d847802d75938b74b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. This indicates the primary purpose is to redirect the user to malicious infrastructure. The PDF also contains a link farm heuristic, suggesting it's part of a larger SEO poisoning or link distribution scheme.

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=circle+of+fifths+piano+pdf
    • http://files.quietlifemotel.com/uploads/1/3/1/3/131379820/xogagebidonasem.pdf
    • http://files.boxeclectic.com/uploads/1/3/1/3/131380547/1d475.pdf
    • http://kumagiti.weddingandtributebands.co.uk/uploads/1/3/1/6/131637814/sidutijibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/nibaxumajekaret.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/38955043154.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2475/files/5841003219.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/55041214169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/wamijofekuvuxetetagano.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/indonesia_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/icy_veins_outlaw_rogue_talents.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/mario_bro_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0431/9756/3037/files/25510182638.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/gezebebizosexegekaxaxizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ba.bin
c30d2c3b4e8507bc9cbc66ef5897a20af51bb7857693e7163aae85587b62783b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 5148 bytes
font_01_sfnt_off0000d335.bin
7d4f56eb08affadafd4a96133f154795996bcb5bd421ac601fb19137524e72f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 11372 bytes
font_02_sfnt_off0000f8fc.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16120 bytes