Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c8580b20872da…

MALICIOUS

PDF

57.3 KB Created: 2020-08-09 21:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66b50e4b5bf9e973317e4ef58155edf1 SHA-1: da939bca57e1b75e8c1f2af0a206c35bb8859803 SHA-256: 5b1c8580b20872da42844e519bf4ba1206558ef8cd4d12b60136ee3863b1a615
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to potentially malicious redirector infrastructure like ttraff.com. The document body, while obfuscated, contains text that appears to be a Dungeons & Dragons character sheet, likely used as a lure. The primary attack pattern involves redirecting users to malicious sites through these embedded links.

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=d+d+3.+5+rogue+character+sheet+pdf
    • http://files.boundlessfarmstead.com/uploads/1/3/0/8/130814258/nurijuve.pdf
    • http://jotexap.hillsideumcgoffstown.org/uploads/1/3/1/6/131636725/2688598.pdf
    • http://zagifefi.dhaynesart.com/uploads/1/3/1/4/131438641/1dd72ca0.pdf
    • http://files.homesteadnigerians.com/uploads/1/3/0/7/130739074/4e03f2a1.pdf
    • http://tejira.gnaaa.ca/uploads/1/3/2/6/132682646/furonis_xasifopomidi_mobosuxoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/52349320640.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/51827394317.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/cacing_ancylostoma_duodenale.pdf
    • https://cdn.shopify.com/s/files/1/0435/4356/0351/files/amlodipina_mecanismo_de_accion.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7624/files/cctv_camera_types.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93880590480.pdf
    • https://cdn.shopify.com/s/files/1/0435/4827/8935/files/12853689082.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/python_trim_string.pdf
    • https://cdn.shopify.com/s/files/1/0449/1211/5867/files/gemischte_bungen_zeiten_englisch.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/86472256619.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/73732999755.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0ed.bin
38ed3d73c7807eff42176110d57b40590a772e99fc05da346730a47d8babfcba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0ED 5704 bytes
font_01_sfnt_off0000b469.bin
d2e634ea6ec6d40d26f2dddc01d6a5b086c707abb2a8bac6bda23419b3049dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 10372 bytes

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