Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c26d5477c527e0…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1a89d3982b7fb549d6cecddfdc9dc8 SHA-1: 0c4576374873f4a2e00a58ebd6f6821accddce92 SHA-256: 28c26d5477c527e0c64cffea413354539ff006ffa24599332532ad2a18143276
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier with high confidence and contains multiple heuristics indicating malicious intent. Specifically, it features a link farm with numerous external PDF links, one of which points to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/wix?keyword=x10+pro+mini+timer+manual, which is likely used to lure users into a phishing or malware 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.ru/wix?keyword=x10+pro+mini+timer+manual
    • https://static.usrfiles.com/ugd/b8c837_9861b9e5a22748e091115c8e140b1ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff64073e6f094029b9ea28720b173fae.pdf
    • https://static.usrfiles.com/ugd/b8c837_2830e2995856465780ee103a7b19d419.pdf
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/21215008442.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/7811470552.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/xugakomif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/42295451700.pdf
    • https://cdn.shopify.com/s/files/1/0463/0826/2050/files/james_stewart_multivariable_calculus_8th_edition.pdf
    • https://static.usrfiles.com/ugd/0c268c_d8a8619892934fd5bedbd518500c254c.pdf
    • https://static.usrfiles.com/ugd/f4de5e_be29b9d0e6684b65ab0db7a6ac87943a.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/aspergers_aq_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/15875270105.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/36664427468.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/anatomy_atlas_download.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_off000060ac.bin
a31b85b2e5ca5f4f23bf58a4cf3e5c0b5797c472a9817e7a342510bf018a150c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AC 4956 bytes
font_01_sfnt_off00007165.bin
e58955b786f52ff319998e9266a84f8cca884061e92c54e2a441181d490ce49e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 9888 bytes