Malicious PDF — malware analysis report

Static analysis result for SHA-256 52422eb4371ef4d8…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 08:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa28955b9a14815e4871540558b8b8c SHA-1: 2ac09981e76d1d972bdea2efcf82dac520e26897 SHA-256: 52422eb4371ef4d8dbe4c50f7b01891116a7419f94d2a5d558d88b58b8c513b6
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a PDF redirector link pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through a seemingly innocuous document to a malicious redirector.

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=liste+suffixes+fran%25C3%25A7ais+pdf
    • http://files.wmhomeschoolers.com/uploads/1/3/0/9/130969018/zevatarizepuvit.pdf
    • http://files.foundationforadrugfreeworldnewyorkchapter.org/uploads/1/3/1/1/131164081/xusezukip.pdf
    • http://files.thefishermansball.com/uploads/1/3/1/4/131452997/wuperuwe.pdf
    • http://files.soilregenerationgroup.com/uploads/1/3/0/8/130874192/bugovig.pdf
    • http://files.artofnek.com/uploads/1/3/1/6/131606819/luxizufevexafaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/kimenelojoxiwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/bevupos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/8701780324.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/azir_pro_builds.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77603652905.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/kutowiverusete.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/random_phrase_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/81016552762.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/temakivoligukolateja.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/29788564375.pdf
    • https://cdn.shopify.com/s/files/1/0432/8321/8588/files/bible_study_for_married_couples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/81024247265.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/duwakesitadakiguxox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/89239287670.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_off00006fed.bin
c82d0a18956e07a06b72415d9f0f9d2571911c7ac272692f684727cc45515555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FED 5196 bytes
font_01_sfnt_off000081b0.bin
3b4470222f4383b5719e9f998b6aa5ddaf96ea3fe782ddbfc1eac569e3ac1a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 11360 bytes

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