Malicious PDF — malware analysis report

Static analysis result for SHA-256 46be2a9682e17ae7…

MALICIOUS

PDF

52.4 KB Created: 2020-08-06 00:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17770b50e591191dfbc63e2b1ed02c23 SHA-1: e9b5c5d44d2ce6f3724b86eb2b8c2d8825003d80 SHA-256: 46be2a9682e17ae767dbecdeccdb02ca0798dbdf76a20eaf6e16e29b79d5fb39
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, with a critical heuristic firing indicating a link farm. One of these links points to a redirector service, suggesting an attempt to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=robotics+definition+pdf
    • http://files.ashwoodcarpentryjoinery.co.uk/uploads/1/3/1/1/131164473/mojidinuvede_xobutojosotim.pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.teamrehab.uk/uploads/1/3/0/7/130739284/fabifut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/66124360414.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/rikukukulezunugatefabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/github_deploy_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/2020_acc_tournament_bracket.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/69333400473.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/31929919782.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/fatobavegoxer.pdf
    • https://cdn.shopify.com/s/files/1/0434/3336/1574/files/capital_one_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/31060776618.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/pillars_of_eternity_sacrificial_bloodlines.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/kavujotoworotusoder.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007797.bin
62e1247784720080c7b05e82d405c1aec2db096addff4eb0367f31d585218ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 7528 bytes
font_01_sfnt_off000090ad.bin
836882b217c75d7aa87b6bdb1d2e62a10b4bb9b16386badd7cd1677278db4eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x90AD 4960 bytes
font_02_sfnt_off0000a1a6.bin
b31e14910981d3792cb5476811112bdca2637ea19544c93496f0aef4b000d63b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A6 10208 bytes