Malicious PDF — malware analysis report

Static analysis result for SHA-256 581d69da6a2685dc…

MALICIOUS

PDF

42.5 KB Created: 2020-08-21 02:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47117e0008f5fdf9b9131a3824e41c4 SHA-1: 7e0f75208c45fe00a54054b7d9eaa556d03a93fc SHA-256: 581d69da6a2685dc351d695108f066c6ffec7150f62407b08b7c5bdd5d3490af
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=resident+evil+5+game+apk`. This indicates the document's primary purpose is to trick users into clicking the link, likely to download malware disguised as the 'Resident Evil 5 game apk'. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning tactic to drive traffic to malicious destinations. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=resident+evil+5+game+apk
    • http://files.activetwa.org/uploads/1/3/1/4/131438583/ea8bd71.pdf
    • http://files.michaelkateboutique.com/uploads/1/3/0/8/130814423/bujujevuwofaku.pdf
    • http://files.lymeislame.com/uploads/1/3/1/4/131437563/1726797.pdf
    • http://files.discerningheartsministry.net/uploads/1/3/0/7/130738993/paloxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/32281667572.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/sherlock_the_abominable_bride_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/meta_tag_for_favicon.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/anthropological_perspective_of_the_self.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/lab_report_on_plant_and_animal_cells.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/blacksmith_wow_classic_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/san_andreas_pc_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/apa_format_table_of_contents.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/74624106495.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/35310499508.pdf
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/42795543524.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/25949586276.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/jusugotuwuzakozemez.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_off00006526.bin
a0cb4634e9952231b27299e40f2ed28d0720202b68ff001bf59a8114614539aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 5440 bytes
font_01_sfnt_off0000779e.bin
fb1302411b2f4e430483eee463c7e049fa3abef99496f7ed2aebcd0bf8da6c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 10996 bytes

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