Malicious PDF — malware analysis report

Static analysis result for SHA-256 db444b5e0051b2c2…

MALICIOUS

PDF

36.2 KB Created: 2020-08-21 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd24b3268886f5bcfdb63699da04dbf SHA-1: a5c08f2b539628b36c8dd2c96ff75fcda0e8cb15 SHA-256: db444b5e0051b2c2e51b2d877b6daea50f6c8d50063774a6a4b5db51aeda5068
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm or SEO poisoning attempt to mask the malicious destination. 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.ru/pify?keyword=punjabi+film+rupinder+gandhi+the+gangster
    • http://bebiwo.brightonandhovehypnobirthing.co.uk/uploads/1/3/1/8/131856072/1141110.pdf
    • http://files.calgaryvet.com/uploads/1/3/0/7/130739443/ae49de5.pdf
    • http://kazuf.arc-sf.com/uploads/1/3/1/3/131379296/4927828.pdf
    • http://files.wikiscreenplaycontest.com/uploads/1/3/2/6/132683088/ninikoravulemiraj.pdf
    • http://files.zoewilsonnutrition.com/uploads/1/3/1/4/131406827/wozudoxigu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/warhammer_40k_necron_codex_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/pojinarodoruvolopaxupedel.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/bogegesufem.pdf
    • https://cdn.shopify.com/s/files/1/0463/2300/7645/files/xokofinupetavudetarevifiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/80552947644.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/welidomubuzed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/gepuzepurisikoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/minecraft_helmet_enchantments.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/54637784019.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/additional_assistant_engineer_civil_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/4401/1168/files/tugoso.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/neuroscience_purves_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/double_digit_multiplication_worksheets_with_grids.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/90293799128.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e00.bin
d2b4b129bdda7cf64067bae2e83a68f5e0a2c04dbea2de1f3d6c889b1642dd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E00 5672 bytes
font_01_sfnt_off00006116.bin
f5b4bf4c154400c8a3d41b88f8422042031b0a6bd3ebc855aa5f5357174268c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 10024 bytes

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