Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d8d122704cb5b8…

MALICIOUS

PDF

36.6 KB Created: 2020-08-29 20:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192991d58e945971e63a25b0b05ab58b SHA-1: 5b96d9c04d534563866f38318358ef1438aa7d99 SHA-256: d8d8d122704cb5b88d0acd3f4c5d6887dfadd1a1e7cf3813e8405da44a46edca
152 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a mass of external PDF links, with the primary link directing to a known malicious redirector infrastructure at 'ttraff.cc'. The document body text, though partially corrupted, suggests a lure related to sheet music, likely to entice users to click the malicious link. The presence of numerous SEO-optimized PDF links further indicates an attempt to distribute 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.cc/wix?keyword=i+dreamed+a+dream+sheet+music+scribd
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/vubewaxifijanitekuvugomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/xapebebedojovugus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/croft_syntactic_categories_and_grammatical_relations.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a89813248842adba99f71001887dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c45884a71143b18055d956689e6f83.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf06db6377ef4ddfb04177b6b9c02e47.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/31844100680.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/47679574583.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_off000044c4.bin
3a0c669ea31bf6e2217ad0667fd838814daf05463e835f2bdb0a53881d6571ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44C4 5224 bytes
font_01_sfnt_off00005650.bin
9d1643c744fc61e1b6244709f2c3297d78144c410b870c48a8d44d51c62af969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 14756 bytes

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