Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f39d88840d0b697…

MALICIOUS

PDF

35.9 KB Created: 2020-08-20 11:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef037def728e309ec188e84f394417c2 SHA-1: 89688575f34c943e6232edfbdf83c5443166cec6 SHA-256: 9f39d88840d0b6978c764f8f1e9988a96ce10318e60fa20e1e92eec12197659a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=adding+and+subtracting+algebraic+fractions+worksheet+pdf
    • http://files.cookwithrayla.com/uploads/1/3/0/8/130874526/2635210.pdf
    • http://vutezala.caymanchoirandorchestra.com/uploads/1/3/2/6/132683097/rabotutelutazurobas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/56577228552.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/pijubilobanodevap.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/65665613394.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/korg_triton_vst.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/alcoro_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/pugivasuroniganuxolomebif.pdf
    • https://cdn.shopify.com/s/files/1/0430/0531/3177/files/tonixeselutagumaxara.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/51610329756.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/sobufa.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_off000040ca.bin
860c47f098a97bdd9e8607926abbbf3488ea60ab3ef954eb4101e74a45e5564e
pdf-font-stream PDF embedded font (sfnt) at offset 0x40CA 5584 bytes
font_01_sfnt_off000053c2.bin
04be3aab54e2cae00ee47e6bb86765b4708f47d4b699634986878a6888cd1f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x53C2 9744 bytes
font_02_sfnt_off00007478.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 4324 bytes