Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90a4bbbfe937f78…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 05:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f25f8fb946745ada430a4d9850775b55 SHA-1: e081db9a12ae2ea1cac3e319dd3a72211e172b0d SHA-256: d90a4bbbfe937f78630eeab2fddfc7184df8c6a2a03a1f22da3df67b40145022
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=tamilyogi+movies+2019++isaimini'. Additionally, it exhibits a PDF link farm pattern, embedding numerous external links, with the highest-priority one being 'https://cdn.shopify.com/s/files/1/0430/4211/1641/files/house_of_cards_season_6_cast_reporter.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure.

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/wix?keyword=tamilyogi+movies+2019++isaimini
    • https://topxbestlist.com/
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/house_of_cards_season_6_cast_reporter.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/katapiwojux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/43962774685.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/99208929826.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6708/files/spm_biology_form_4_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/luroxumobibedobemazetogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/bopizepesexijabokipusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/operation_management_heizer.pdf
    • https://cdn.shopify.com/s/files/1/0465/0100/3422/files/diabetes_diagnosis_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/android_wear_version_h.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/76083019319.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/xobonofodidofu.pdf
    • https://static.usrfiles.com/ugd/b8c837_31d6aa0e9d5543118ae26bcf2e4f5273.pdf
    • https://static.usrfiles.com/ugd/b8c837_19d9407701564c2891419850f091e039.pdf
    • https://static.usrfiles.com/ugd/b8c837_da923d8e0cb145138256777d30adc7e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_045c8803e1334c8597865010da3dde43.pdf
    • https://static.usrfiles.com/ugd/b8c837_7492fa46f0884664b73071ecbe1ce725.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_off00005ece.bin
bf0fa1deb3c528e2a4c3b63213cf5a913880369507cc929c43f3325fd48f9c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECE 5500 bytes
font_01_sfnt_off00007190.bin
b342849fea1386bc4c0c5df215060140a1840705ff43223975071803e2336076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7190 13304 bytes

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