Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a6bf0429ba2a36…

MALICIOUS

PDF

40.9 KB Created: 2020-07-31 19:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0caa980d2a7e17d3131a633bc422aa59 SHA-1: 7f2249eaae5071c75c28b7389e6d7e54a2aab610 SHA-256: 92a6bf0429ba2a36f0979eb7078e94470a35d22cf16c5981187a302bbecce409
152 Risk Score

Malware Insights

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

The PDF contains a deceptive "Midco speed test" lure and embeds a large number of links, including one to a known malicious redirector at `https://ttraff.com/pify?keyword=midco+speed+test`. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or redirection strategy. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a malicious redirector.

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=midco+speed+test
    • http://files.plasteringredbridge.co.uk/uploads/1/3/1/3/131383771/7932643.pdf
    • http://files.clinicaespacosaudebeleza.net/uploads/1/3/1/1/131163872/d00290233b6.pdf
    • http://files.forestandwatersolutions.com/uploads/1/3/1/8/131857723/jokubodefij.pdf
    • http://files.westtechmobile.ca/uploads/1/3/1/6/131637562/rapigew.pdf
    • http://files.scenichillretreat.com/uploads/1/3/1/1/131163705/xowube.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/vovojagepirinaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/mafuvemitumatowulawiraga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9883/files/sing_a_christmas_carol_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/25657015294.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/28994599196.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6074/files/4157578598.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/xugevoxumoremalonije.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4457/files/24669053881.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/tanufulajogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0899/files/xafodamixogukol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/tevunasegodawej.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_off0000637f.bin
4bbf17f0a736f0be75941f0336626e463d5c6cf082f2c684f0a43c731356f0fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 4736 bytes
font_01_sfnt_off000073bf.bin
5cdf43bfe73140108800ee0aaf48d5ac70a497fb2418d14ac792eda225bd3b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 10328 bytes