Malicious PDF — malware analysis report

Static analysis result for SHA-256 478c2f56b8703465…

MALICIOUS

PDF

42.1 KB Created: 2020-08-13 06:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf22c1aee49dd6beaf6414fd96bda6a SHA-1: fc6bff2c878985eac228a6c49938f8ab43320c69 SHA-256: 478c2f56b870346591de96a71de80c76811f4de7dd5b0a9508aadc6478e7e826
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=labrinth+jealous+sheet+music+pdf
    • http://files.digitalmarketingeducationatsiena.com/uploads/1/3/1/8/131872037/3bf2a.pdf
    • http://files.threelyonscreative.com/uploads/1/3/0/7/130776065/ed0e7.pdf
    • http://popim.aleksandarmatovski.com/uploads/1/3/1/0/131070447/pugifejuvatuwex.pdf
    • http://files.marketing-truth.net/uploads/1/3/1/0/131069879/9629543f0.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/begajugopebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/30145805929.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7858/files/cash_inflow_and_outflow_statement_examples.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3586/files/autoimmune_paleo_diet.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/icthlarin_s_little_helper_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/46624684144.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/64239812817.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/dogadogabuxuxi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1391/2222/files/red_dead_redemption_xbox_360_gamestop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7977/files/1308554597.pdf
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/89212602086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/73924173027.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_off00005261.bin
540a4f102b3f0d74e7a2492edd1c3bd72118db856aa471d4957e923d01a19c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5261 5552 bytes
font_01_sfnt_off00006513.bin
384e03b67bd7f64e40d1402e86eb3cdcaf96fdc1205dc800c05439a6bb71ca97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 9660 bytes
font_02_sfnt_off00008664.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8664 16120 bytes

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