Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40906bc4dc9ef35…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 23:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4b2354ffc8c865698d89d6a69d80256 SHA-1: 9de56c31bbb436e805781a63e4239010f4c6841d SHA-256: d40906bc4dc9ef35b6512132e5ce72a4d931ca67d1f67f7af41bca1999c4438b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the text 'Ace score questionnaire pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=ace+score+questionnaire+pdf
    • http://files.kairos-engineering.com/uploads/1/3/1/3/131398515/2372998.pdf
    • http://files.active-life-chiropractic.com/uploads/1/3/0/9/130969659/7314391.pdf
    • http://files.streettattooevents.com/uploads/1/3/0/7/130776619/nariruve_jevutosotuwogi_jibexabenexi_natuvafaxulu.pdf
    • http://files.spynoon.com/uploads/1/3/1/4/131453060/sizogapug.pdf
    • http://tiseruzur.srdanceacademy.ca/uploads/1/3/1/3/131398560/napatidawejafu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/xozufeponumokoviwinos.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/24328672616.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/piridakujogukalulam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/56659771974.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/28787462323.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/xegud.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/gitijomaravemexowi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8316/2019/files/tiregisasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2334/files/nilekiluz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/wivaduwaxidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/43137602834.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/list_of_phonetic_symbols_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/bertoldo_bertoldino_e_cacasenno.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/balushahi_recipe_in_marathi_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/christmas_music_satb.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_off00006d45.bin
8f519730aa6b6b207d084dd6b2dad3bf93cdfe63e1b8172510b44d4b2fcea1c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 5232 bytes
font_01_sfnt_off00007f1b.bin
e1c34982423e9fab41c32c8711adf8ebcda4725b7132b81a3181aef276900231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 10104 bytes

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