Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94089d70aef353e…

MALICIOUS

PDF

46.7 KB Created: 2020-09-08 09:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cadc0af0e818edb3b8a676009ae6d9d9 SHA-1: a7fd3df8337151057f7bdf563beb3973847e43bf SHA-256: b94089d70aef353ef4e1513bf59aa1a781fff25183b66534df4f21f6d012d499
152 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=milady+chapter+6+review+questions+answers'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Milady chapter 6 review questions answers'. The presence of numerous benign Shopify links suggests an attempt to blend in with legitimate content while directing users to the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=milady+chapter+6+review+questions+answers
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/frame_io_workflow.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/83653295199.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/44587228925.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/vesokagawodab.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/game_catalogue_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/kimiwugimajobirelelal.pdf
    • https://cdn.shopify.com/s/files/1/0439/1541/1608/files/35016318145.pdf
    • https://cdn.shopify.com/s/files/1/0429/0743/5167/files/propiedades_fisicas_y_quimicas_de_los_aldehidos_y_cetonas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/90998412158.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/trend_router_guide_bush_set.pdf
    • https://cdn.shopify.com/s/files/1/0439/1079/1323/files/72065084932.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/vivalimibiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/sitaduvudiv.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_off000077b2.bin
42377876b6e14b30b7ea65be02ae1e3c85b5e8422b44985cfa36614895d3a8a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 5700 bytes
font_01_sfnt_off00008b39.bin
88d9e498003a884486d2aecdf94711203043788f8f4ca291eb097eb620211d35
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 10048 bytes