Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db029bbb613b003…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 18:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a21cac443c0e100dd7202429a9dfaa6 SHA-1: bbd1fa6e122d957098745e9f19b17702e38341b5 SHA-256: 3db029bbb613b00327c2b5e7130aed9798e0661684e6196d879bafc232a5114c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'aw139 maintenance manual pdf'. The presence of a link farm and the ML classifier's high confidence score further support malicious intent. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=aw139+maintenance+manual+pdf
    • http://files.mgracetransitions.com/uploads/1/3/2/6/132683088/nuvoxufamesas.pdf
    • http://papoxuro.aymestreyschool.com/uploads/1/3/1/3/131398020/7114765.pdf
    • http://xezinuru.artdecuivre.net/uploads/1/3/1/4/131407148/kakamezebejagigexu.pdf
    • http://lafajamex.elizabethashdown.co.uk/uploads/1/3/1/8/131857054/nudoxuteri.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/93170043004.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/65988091947.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/defizolakilebatan.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/25309587599.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/bsc_chemistry_syllabus_tribhuvan_university.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/18135890533.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/23947003991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/rirojazup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/17598506551.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/ag_lafley_playing_to_win.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/humana_military_patient_referral_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0445/3348/1636/files/basic_electronics_dover_books_on_engineering.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_off00006a3a.bin
6b5fda2f4c9237bc0855eba31ed33810d5583c0ff45a29c624c006f73cf501d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 5480 bytes
font_01_sfnt_off00007cda.bin
1ab555a64581cbd15843a274b6ac3fc0e5726a375b4d3a906856e5b8ed3fdbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDA 10136 bytes

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