Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aa5996935a5a76…

MALICIOUS

PDF

47.0 KB Created: 2020-08-17 14:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6996c2749e13c060a3f14f1d3c11105 SHA-1: 302379d37db0b384a4cf245ebf589d9c34440298 SHA-256: 42aa5996935a5a76a344cda805b8b77e9f331329a51923838d85d83ef18fff3d
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains the URL `https://ttraff.cc/pify?keyword=atresia+duodenal+pdf`, indicating an attempt to lure the user to malicious infrastructure. 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.cc/pify?keyword=atresia+duodenal+pdf
    • http://xijepeg.annadangerfield.com/uploads/1/3/0/8/130814328/4583242.pdf
    • http://files.gregstensonwriter.com/uploads/1/3/1/3/131383953/fomoka.pdf
    • http://files.moveeasychiropractic.ca/uploads/1/3/1/3/131379803/jinizodowesezokafira.pdf
    • http://files.sarahrileyceramics.com/uploads/1/3/2/8/132814250/wopida.pdf
    • http://gajopol.anetagrygarova.com/uploads/1/3/1/3/131383657/46efd3fca.pdf
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/dejuvosuwefi.pdf
    • https://cdn.shopify.com/s/files/1/0455/3284/0101/files/natosetimomebufisujon.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/rogudamodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/59943877680.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/87478889576.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/nadenep.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/34023555858.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/adobe_illustrator_free_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/algorithms_sanjoy_dasgupta_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0743/files/kolupesake.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/zemiwog.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/jawubos.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_off0000743c.bin
63e9f8f748e92bf8ab0a9ae02a26a552d32caaebb949a521e28222cba8bb3669
pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 5024 bytes
font_01_sfnt_off0000855f.bin
ede797c3edeea23366ed8a077fbce6f5dec59e9d77781d6331413f99132f073b
pdf-font-stream PDF embedded font (sfnt) at offset 0x855F 13140 bytes