Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6dc35a8466072c…

MALICIOUS

PDF

49.3 KB Created: 2020-08-14 11:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba2d142e9417f283b70ea6385429a1f SHA-1: e31a13fd85c37d39194c856759fd17168c29f411 SHA-256: 7b6dc35a8466072cc1ac21574b8c08f8efe645b63d2bfdfd51b1d2f2ec8432de
152 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. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=best+free+to+play+cross+platform+games, which is likely intended to redirect the user to a malicious site. 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=best+free+to+play+cross+platform+games
    • http://files.statedshowroom.com/uploads/1/3/1/3/131398547/dedido.pdf
    • http://sasupujof.studiodune.com/uploads/1/3/0/7/130740178/paros-kebene.pdf
    • http://files.originalnest.shop/uploads/1/3/2/6/132682790/1418538.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/lipofuscinosis_neuronal_ceroidea.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/average_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/antenna_theory_analysis_and_design_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/mufakafosabovuduwokaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/jukowamomekusewenezedog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fodafozisejuleluz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/public_officer_appointment_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/pifupunolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/kavifemagapavafixenufaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/tomixoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/85493472242.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/abituriyent_jurnali_1.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_off0000761c.bin
f378b96c0829c87d8dc9b4c7432b79201346525b7e774fa83572b2a70d69a09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761C 5120 bytes
font_01_sfnt_off0000879b.bin
b0775b37950c4a963e212fc59696f067476969b66d319aa9945c338588a5a31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879B 10148 bytes
font_02_sfnt_off0000aa5c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5C 4324 bytes

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