Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cae4baf267d680…

MALICIOUS

PDF

45.8 KB Created: 2020-08-09 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004671527a2123adb9c557a029fea22a SHA-1: 358446c9486bf711d016eababbd1189287bdeb1a SHA-256: 61cae4baf267d680dd4c0181dc0b69b643ed9e631e4577f717df5955b5050e6e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=add+png+to+pdf+document'. The document body also contains this URL and a call-to-action phrase, indicating a likely attempt to trick users into clicking the malicious link. No scripts were extracted, but the presence of the redirector and link farm strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=add+png+to+pdf+document
    • http://files.seafaith.net/uploads/1/3/1/4/131437834/7185734.pdf
    • http://files.ourchildrensfund.com/uploads/1/3/0/7/130738998/a4a95affe5cc29c.pdf
    • http://visugawen.barkway-village.org.uk/uploads/1/3/1/4/131407406/sogulapopinome_nukezi_befijaferidavo_gubibegiwe.pdf
    • http://files.meldesignworks.com/uploads/1/3/1/4/131437330/6472602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/let_us_c_yashwant_kanetkar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/article_19_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/13129617629.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/download_nuance_power.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/1773980317.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/biological_science_freeman_7th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/61984791161.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/59832373826.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/pufora.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/difference_between_bolt_and_screw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/wedilupejesidovurosazi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ca.bin
83eb948778f44171c1856ab30d62d7b71909dadd1fe736e4d3dfbcaf57d5d733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 4784 bytes
font_01_sfnt_off00007300.bin
96aff9aa2eb3dc2034db61855b4f511436f14a2bc5300644df4b95aad05e27d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 12696 bytes
font_02_sfnt_off00009c8c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8C 4324 bytes

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