Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca7dd6c7678c8d6…

MALICIOUS

PDF

35.0 KB Created: 2020-08-05 16:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89185eb44b6cdcccb00dc0af0ef5318 SHA-1: b3ebd2ce98613d1d639b725f576ecc337889c9d5 SHA-256: bca7dd6c7678c8d614627e584b20909d609090e8824827b65aeb604e4df349b5
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.com'. The document body, though heavily obfuscated, contains the same URL and references 'Strength of Materials PDF Khurmi', suggesting a lure. The PDF also contains a mass external PDF link farm, with many links hosted on 'cdn.shopify.com', indicating a potential SEO poisoning or link farm distribution technique. 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.com/pify?keyword=strength+of+materials+pdf+khurmi
    • http://files.moreeshowsociety.org/uploads/1/3/0/7/130739542/6999c1db0.pdf
    • http://files.danielspero.com/uploads/1/3/1/4/131453451/getanolap.pdf
    • http://files.fionacompton.com/uploads/1/3/1/3/131383864/litarokog_vufiwupotel_zusasulunejemi_zarof.pdf
    • http://files.americasbluesmovie.com/uploads/1/3/1/3/131380641/zedozaduxixo-gimato-mikixejijudepi-nigedijevo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/60431589235.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/3400523514.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/tanifekajosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/44239489792.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/52219870985.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/all_you_zombies_heinlein.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/7726389664.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/56117381131.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/36389817549.pdf
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/comparative_and_superlative_adjectives_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/wolaranot.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/lafukewuxekix.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_off00004c1f.bin
12a5c1a85fdbf5a2b89349b7d9fc4b8adaf5ae859be36d9a02ee56cb2f9af2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1F 5620 bytes
font_01_sfnt_off00005f10.bin
906762657ee5f4b0998ecb5de9e7f79d725129ac3b7252e194d4fce8bfcb5895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F10 9420 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.