Malicious PDF — malware analysis report

Static analysis result for SHA-256 903a11beba57a8ce…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 00:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b2f24638b8c0b5fe7170125a1cc0a58 SHA-1: 7c14e1b0ba23e5c25eb524636e8d5c8b9fe8c6d5 SHA-256: 903a11beba57a8cec931bbf9b24cded861cc8bec0fee7a9faa09d5af552e6fa6
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many hosted on static.usrfiles.com, and a critical redirector link to ttraff.com. This suggests a campaign focused on SEO manipulation or redirecting users to malicious sites. The ML classifier strongly supports the malicious verdict.

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.com/wix?keyword=sam+mann+car+collector
    • https://static.usrfiles.com/ugd/b8c837_3d8d25558c324058b98cf572a12700a8.pdf
    • https://static.usrfiles.com/ugd/65b209_2ec1c545995b4d028f6beebe6eafcc6c.pdf
    • https://static.usrfiles.com/ugd/3e87bf_139f1f9b41244fda9649a8632810543c.pdf
    • https://cdn.shopify.com/s/files/1/0428/3419/8684/files/symmetry_financial_group_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/height_balanced_tree_in_data_structure.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/32078684158.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/angular_formgroup_find_control.pdf
    • https://static.usrfiles.com/ugd/b8c837_82dbe24541994cccb731040fab8ba8dc.pdf
    • https://static.usrfiles.com/ugd/9b33c5_1ac5af3d61be4d218c9e903032f1e7e4.pdf
    • https://static.usrfiles.com/ugd/67e251_6dda85b7d9af4f35b8144fc98770183f.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_d223096df22348beb2fc075c69977fd9.pdf
    • https://static.usrfiles.com/ugd/913720_0f3f15dc984345df8799b96d0bdb7f30.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/43998587112.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/8786353093.pdf
    • https://cdn.shopify.com/s/files/1/0434/5295/6838/files/tifalotevunilererexupire.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/college_baseball_world_series_bracket.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_off000072ae.bin
4724291f23454fbb8a6e157fcf20a7dfb9e8c29b8fff6a5f887765689f890f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 4868 bytes
font_01_sfnt_off00008313.bin
d39117cb4a5943beb4f3ba38aee58da403edc68a84790b2696e701c655ef79d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 10352 bytes