Malicious PDF — malware analysis report

Static analysis result for SHA-256 943476c542ef8aa7…

MALICIOUS

PDF

50.4 KB Created: 2020-08-22 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d137bc00f22a7fee42199697eae6fe98 SHA-1: df4f84a99d1f5e1d43634d1e4d58f33ef293f0c3 SHA-256: 943476c542ef8aa76e329da70f2b51d39ecaac8d99b051ad03ca27b6632891d5
152 Risk Score

Malware Insights

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

The PDF contains a deceptive document body masquerading as academic results to entice users to click a link. This link, identified as a malicious redirector, leads to further malicious infrastructure. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of an SEO link farm to obscure the malicious destination.

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.cc/pify?keyword=mark+sheet+of+class+10+2019+cbse
    • http://files.referendumcentral.org/uploads/1/3/0/8/130874435/fesetitojana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/tifojise.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/22525933147.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/wukadidefel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/how_to_extract_subtitles_from_mkv.pdf
    • https://cdn.shopify.com/s/files/1/0452/1259/8423/files/candy_metadata_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/75137140318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/66626965506.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/6351806127.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/hallelujah_leonard_cohen_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0398/4547/files/farberware_air_fryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/binomial_option_pricing_excel_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006313.bin
3ba882d14bbcd9580596b0d09141b9edff321df84204636bb97c5a06734ae671
pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 5660 bytes
font_01_sfnt_off0000764e.bin
dc9ebcf7cd3d0a4764148c39e6ce1a3badcb76c9d5a02d2b7663a48fbea2df0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x764E 3264 bytes
font_02_sfnt_off00008419.bin
8ffcff5ed95044a2fa1a5d9ded5fa366ca6b9f834d12437f62d8882a0d7773d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 10152 bytes
font_03_sfnt_off0000a711.bin
676a6f9980301d650ad9b511319da6dac9fff4f77c228169d287e5253a078183
pdf-font-stream PDF embedded font (sfnt) at offset 0xA711 16148 bytes