Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f403445e1701604…

MALICIOUS

PDF

57.9 KB Created: 2020-08-13 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec2d294b5060c15df3fd98f1c4476075 SHA-1: 6a58e0d463011b5eecd53d956b5c7ba7b2fac3d7 SHA-256: 2f403445e170160410684682e3172c01bac91137b782bc47898ff9b1a3b3b1e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that directs to `https://ttraff.ru/pify?keyword=english+speaking+full+course+pdf+download`, identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to trick users into clicking the link under the guise of downloading an English course. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm strategy to obscure the malicious destination.

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=english+speaking+full+course+pdf+download
    • http://monivid.mindyjunekelly.com/uploads/1/3/1/3/131398134/4962253.pdf
    • http://files.exposingtheelca.com/uploads/1/3/2/8/132814343/d18d9.pdf
    • http://files.gabypruittphotography.net/uploads/1/3/1/6/131637137/58e895ce35.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/71058553938.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/ejercicios_verbo_avoir_y_etre.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/mechanics_of_materials_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/bupunokikiverexawo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8184/9245/files/bewebuzije.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/rukelubez.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/72487727102.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/42929357112.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/problem_solving_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/canon_mg2900_ink.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/bujafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/10855016316.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ccc.bin
da7c47d648f0cabdf1ea31b58148e6c0dd5d1c52a196ec6ad78ef859ccbb0ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 5532 bytes
font_01_sfnt_off00007fa1.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA1 3720 bytes
font_02_sfnt_off00008b04.bin
76070c36b7c541d493a1eb8c879103e03c3c80718165a984f7c48cb13dc9b6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 15220 bytes
font_03_sfnt_off0000bac2.bin
7af917c16097a4d1ff9afafba98bf32e1fda7c12fcda2432c659751cf16e278a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 10084 bytes

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