Malicious PDF — malware analysis report

Static analysis result for SHA-256 27618237a76df53e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-12 20:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101a2f61072d5f975c2c2821d2f993cd SHA-1: 618ca166076984b9edc469411fed75b496f7a8f1 SHA-256: 27618237a76df53edf45ffc1c87ad899a2f61aa2e0c330552e4fb7c726dbf377
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains multiple embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=destilacion+arrastre+de+vapor+pdf'. Another critical heuristic indicated a PDF link farm, with many links pointing to shopify.com domains, likely for SEO manipulation or to host further malicious content. The document body itself is heavily obfuscated and contains the malicious redirector URL.

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.com/pify?keyword=destilacion+arrastre+de+vapor+pdf
    • http://wigado.herothrillshow.org/uploads/1/3/1/4/131437736/butunivit-rutotekewu-bogikobi.pdf
    • http://gujovese.greerunderwood.com/uploads/1/3/2/8/132815367/nigezenibetulofineg.pdf
    • http://files.corey-s.com/uploads/1/3/1/6/131606046/dutejanomufede_wujonuguwarovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/point_mutation_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/78245744252.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/12814513389.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/nutunobeluwibavejazuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/rawogijajol.pdf
    • https://cdn.shopify.com/s/files/1/0439/9779/0366/files/what_is_a_webhook_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/national_holiday_calendar_2016.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/xiketapovus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/complicaciones_de_la_anemia_drepanocitica.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/aprendizaje_colaborativo_en_el_aula.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/xatimozetibib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/ponogozigorod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/anna_karenina_leo_tolstoy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1808/files/for_dummies_collection.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_off000061bb.bin
8a9d0ff843f0c7a2d878b926b8315c67fbcbadf9e3a05b1c7e7f781836c67d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 4996 bytes
font_01_sfnt_off000072ba.bin
65ca8317ad6dcfd5212412af98b442737932088dd868409916177e05d3a364df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 11328 bytes
font_02_sfnt_off00009780.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 4324 bytes

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