Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9eb70bb9bf9616…

MALICIOUS

PDF

37.9 KB Created: 2020-08-08 05:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4b6450a9dff7ffdfec9bbeef1b3bf2 SHA-1: f6f91ffba669086140e5d92461f055e3112982fb SHA-256: 1f9eb70bb9bf9616fc2bc1ccea450965fcbc8881f8228129079cbe48c6892084
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link redirects to known malicious infrastructure at ttraff.ru. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

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.ru/pify?keyword=active+and+passive+exercises+pdf
    • http://files.ddrncboa.com/uploads/1/3/0/7/130739375/pegubonojix.pdf
    • http://vunum.meadowandfawn.com/uploads/1/3/2/3/132303374/4413446.pdf
    • http://files.centerforpilates.com/uploads/1/3/0/7/130775027/kemipozijatagivijux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/questes_de_administrao_pblica_fcc.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/10366719258.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/xixofus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/71934205230.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakuxosisubesabemobaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/29155800522.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/21581947490.pdf
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/how_to_connect_ammeter_and_voltmeter_in_a_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/89962323022.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/21440663522.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/sedizurejodegilosejeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/77458913329.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_off00005639.bin
9f5c0cc1469643e5de5890b9c619da86c8d08ba918f61dc33edcd4c8da5d2f17
pdf-font-stream PDF embedded font (sfnt) at offset 0x5639 5232 bytes
font_01_sfnt_off00006823.bin
3da08b65b22d89ac2c2432ebb5af44dc6fd00e33fd2ce95b17f7e9163433dde8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 10164 bytes