Malicious PDF — malware analysis report

Static analysis result for SHA-256 1623df638831dfd5…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 05:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1ef68ec97024041703cd64130e24b4 SHA-1: 812a430a9558109959f35ebd579196954f97ead2 SHA-256: 1623df638831dfd555d1cb9abf7dc44323f7e9509225a4ca1b9b7c4541d173ff
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Whistler xtr 338 manual'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=whistler+xtr+338+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/dedavulexijegipefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/jio_mobile_in_play_store_video.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/bharat_chashni_video_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/29411025690.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/palabras_basicas_en_ingles.pdf
    • https://static.usrfiles.com/ugd/58a813_7fb4ac0747a44cb68736976aae0be8fd.pdf
    • https://static.usrfiles.com/ugd/3e87bf_eb8ab79a144f4aa286ed5c0302aabd06.pdf
    • https://static.usrfiles.com/ugd/2c8d66_01c9c412005d43a6a996c86069e175ff.pdf
    • https://static.usrfiles.com/ugd/48d9a1_2abfba13d73f4587a8c3b537feffaa51.pdf
    • https://static.usrfiles.com/ugd/3b47cb_1bcc9aedb6d545b2b9679af581ab1357.pdf
    • https://static.usrfiles.com/ugd/ca32a8_e54d296623544fcfbdc0adf45c01bc25.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d9d.bin
ea1537c5d4bda718681382840dc842f9d8d7b1208acc5198adfbe00556f035da
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9D 5136 bytes
font_01_sfnt_off00005edb.bin
2f9366fe41fe24daaca89c047e19d3fb5c0e585f13525d6480407d0cc5ad4c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 10604 bytes
font_02_sfnt_off00008313.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 4324 bytes