Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8c7da9d2b33bb…

MALICIOUS

PDF

52.9 KB Created: 2020-08-18 22:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30f0a9a06c5b61c7da76bcd714eddaf SHA-1: b7b41595f5125911167f956665f39378882de858 SHA-256: 77c8c7da9d2b33bbd7345868d4efa985c3e5df61b476f5bb596cfc9da54bb9ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text "R a s ki full form" and a URL that matches the redirector link. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery. The presence of numerous Shopify-hosted PDF links, while some are benign, contributes to a link farm strategy, potentially to improve SEO for malicious content or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=r+a+s+ki+full+form
    • http://betufo.creditrepairsyracuseny.com/uploads/1/3/1/0/131069991/wiwujenov-jedadadediri-mazolivugifago.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1485/files/geribixuxolutav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/49288198048.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/71340585719.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/9584908362.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/american_psycho_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/tv_guide_magazine_buy_online.pdf
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/lausd_web_filter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/65088209073.pdf
    • https://cdn.shopify.com/s/files/1/0450/6412/6616/files/accelerating_commercialisation_application_form.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006292.bin
23699acfac17e7e5d34264aac43a3a753b701eb66f3cc094fdd785a3e0ba5ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 4560 bytes
font_01_sfnt_off00007204.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 3720 bytes
font_02_sfnt_off00007d67.bin
4b95a2aff28691b073c10251774e09261211d128740ffe2e12e93ee2ad53a823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D67 10308 bytes
font_03_sfnt_off0000a0a5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A5 4324 bytes
font_04_sfnt_off0000aea6.bin
bddaa7638e1fe33f9d69ed7302e015b6d64dc8f91d34f5d2f6f351e5bed4ca09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 6824 bytes

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