Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d234133b7074b1…

MALICIOUS

PDF

45.8 KB Created: 2020-08-19 01:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b223673270e199129e8c9e8270a8ff8a SHA-1: 266d4ddb81e6a0dc7a53b57a555c6c93e5f1b707 SHA-256: 24d234133b7074b1ced43243ebaf0adb2f3351c732f05597c29cfd3503b096f2
150 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, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'bed sheets shopping online' and the malicious URL, suggesting a lure. The PDF also contains a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bed+sheets+shopping+online
    • http://files.stonehamcdc.org/uploads/1/3/0/8/130813643/tiduzimijo.pdf
    • http://files.thediscouragedfeminist.com/uploads/1/3/1/3/131398428/80511444b.pdf
    • http://files.glapousis.com/uploads/1/3/2/6/132695200/gamokapaverumapis.pdf
    • http://files.dannyanthonywritings.com/uploads/1/3/2/7/132740291/duwevekimizak-lomizinijujaguk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/46646787969.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1271/files/78050150814.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/sufavizepoxujiravoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/bible_verses_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/makine_elemanlar_birsen_yaynevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/lasibapavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/vindictus_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/33310239431.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/bojapogodomelafanazuze.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/pamebipuvago.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/ankilostomiasis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/33706269554.pdf
    • https://cdn.shopify.com/s/files/1/0446/8441/1033/files/english_short_story_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/bomemawele.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/jetson_tk1_datasheet.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_off000075ef.bin
ac477ad49154f889fa1661c47a5cfc95b33a43e58b828d38581da9157b2a5abf
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 4964 bytes
font_01_sfnt_off000086d8.bin
22592db600728439320d4f5cc55136e9892e09087b18a1ead1d3404c458d3f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 10324 bytes