Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90fbf443664857…

MALICIOUS

PDF

45.0 KB Created: 2020-07-29 12:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fce07113992787da26a6a4dd35426ad SHA-1: 7e2acf4bd36d12daf2c519d180153a7e39aa9d6c SHA-256: ba90fbf4436648574bc7b4b5badb27e6de0547bf4985f3b1f89850bf01b83cc7
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. Another critical heuristic indicates the PDF is part of a link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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/wb?keyword=diagrama%20bimanual%20simbolog%C3%ADa%20utilizada
    • http://files.positivebirthlbc.co.uk/uploads/1/3/1/4/131437724/nixajasuwu_domamekirab_zevizarimow_boruzatumuzufa.pdf
    • http://files.threeonabbott.com/uploads/1/3/0/9/130969377/709123.pdf
    • http://files.columbusliceremoval.com/uploads/1/3/0/8/130874317/ruxiwuli-zebupodi-lerar-zasajedonorite.pdf
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://files.positivebirthlbc.co.uk/uploads/1/3/1/4/131
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/40214442632.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3349/files/7565138322.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1779/files/fezefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/vinevufewuralas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7007/8617/files/zobapimiwekajefevif.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/98577263118.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/3708908920.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/60864498913.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/22120246303.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/54002011383.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/27299310354.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/runujivevasakegagupige.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_off00007041.bin
0a4e6e6e5158bfed795bb632c284940e3cc6453b888ab00ecdc9ca3b40f1ce64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7041 5152 bytes
font_01_sfnt_off000081a6.bin
46594157509bdb8bddd42694a06691534df90e42d9497986f9863a6e95950d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 10752 bytes

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