Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfba45f2ac0f63c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 10:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75738579ebb4c094b1358ada8f43d22 SHA-1: 9503a09d775c93f1004aa6094ab86a41ca2bf3d9 SHA-256: 6bfba45f2ac0f63cb3601667f010330ae63280ced13d268c9ab396365c1396fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary link identified directs users to a URL that appears to be part of a link farm designed to host numerous PDF files, likely for SEO manipulation or to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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=application+store+apple
    • http://lukalito.de-benedetti.com/uploads/1/3/1/4/131406069/senufaro.pdf
    • http://vesavakev.phisigmapidavis.com/uploads/1/3/1/0/131070374/pagadu.pdf
    • http://files.cameliascandles.org/uploads/1/3/0/9/130969075/nijagobagufuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/esquizofrenia_paranoide_cronica.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/niserenaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/geligup.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/how_to_remove_emojis_from_text.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/kutesegivukidepuduvinas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0435/3117/4043/files/multiplying_fraction_models_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/jovovefawusivabet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/45874931024.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/trial_and_tribulation_ace_hood.pdf
    • https://cdn.shopify.com/s/files/1/0433/4786/9850/files/boboiboy_solar_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/bash_optional_arguments.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006568.bin
ba27bf262b5f4b9f113b0e32a1c352bc101121fc4fd3a3357ed0615fc5df2f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 4916 bytes
font_01_sfnt_off00007625.bin
9940bd16305fffc9b018429d676106fc63d351e913de4e4976612573d2365d35
pdf-font-stream PDF embedded font (sfnt) at offset 0x7625 10596 bytes