Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23d594d5c234ca1…

MALICIOUS

PDF

61.9 KB Created: 2020-08-04 18:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d359d4e7ae7bd9867f97cbc6a996f399 SHA-1: f44fa9c817660e2616e78ae514a934ea6aade564 SHA-256: a23d594d5c234ca127b49d4ad282f2808f81c65c7b13ac2ae8ad738f40bc6b37
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to lure the user to this external resource.

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/pify?keyword=cadena+de+suministro+lala+pdf
    • http://files.anastasiacollinsart.com/uploads/1/3/1/4/131437623/lilekotakuxanag_wipazeluki_sigage.pdf
    • http://files.poofdirtfarming.com/uploads/1/3/2/6/132682040/sanaluvomajekaj_zabimaguk_gumewoduzetu.pdf
    • http://files.chicagosanon.org/uploads/1/3/2/6/132681394/97a4cbd6a.pdf
    • http://files.goodandgraciousco.com/uploads/1/3/1/3/131383342/db365acd.pdf
    • http://files.wickerdfarm.com/uploads/1/3/1/4/131407357/396206.pdf
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/gasagunojiduviwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/tmux_kill_pane.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/xaludunudifik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/25035655528.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/leed_green_associate_v4_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/8650371914.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/duwevizakojifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/jurovarubebubuwivefuta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/15406551808.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_off0000aadb.bin
90cce46f7d579663f06695802676820c72819829d7b98d3a7fb70fdf4e04f40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAADB 1796 bytes
font_01_sfnt_off0000b33b.bin
772323d01df29606c2239b586684eaf9aac1f4167c5c413c34a02de9c36a9949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 5092 bytes
font_02_sfnt_off0000c46f.bin
87725ea8c3e843720bd1190bb9fc62b4a5a3c69b948c435eb90b50f7fb3d2d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC46F 11664 bytes

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