Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd9fc41aef9c92…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 03:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0eeb0d663e6f00ee84c7c5ed078b98f SHA-1: 8d45a52f04bc1bf9bacbcce3b73dad3dcd48e22e SHA-256: 54dd9fc41aef9c9261ab2b346001388cf58f9a46a7d5cf422abd42cd54442446
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=zyxel+nsa+wordpress, which is identified as a malicious redirector. Additionally, the file exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on cdn.shopify.com, likely to obscure the malicious destination.

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/wix?keyword=zyxel+nsa+wordpress
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/62660517637.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0509/files/amoeba_sisters_video_recap_of_meiosis_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0258/3449/files/adding_and_subtracting_negative_numbers_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/mewegigofonotu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/37463859734.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/sabedibuwepukijezadax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8881/files/83675292379.pdf
    • https://cdn.shopify.com/s/files/1/0435/2720/9120/files/gogepiwowapug.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/canetti_auto_da_fe.pdf
    • https://cdn.shopify.com/s/files/1/0448/2508/4065/files/adding_and_subtracting_integers_lesson_plan.pdf
    • https://static.usrfiles.com/ugd/07ef24_dbec94dc33bb40178ff117931da66610.pdf
    • https://static.usrfiles.com/ugd/39cb9d_2c59f42fd8624932b2d33ebd2f91884a.pdf
    • https://static.usrfiles.com/ugd/a64c8c_b472e6411991431296445b067a82177b.pdf
    • https://static.usrfiles.com/ugd/dc98cc_2671cc7fbc2247a7a4628ef382de10ce.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/tamilnadu_building_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2773/files/fesokogunubekozaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/fikogokedeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/6576/0151/files/fuzonevopumivikupinedebum.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_off00006fd9.bin
09b6724b73589135dae6e8ca8f7f709e2cb584067d5ce81c5701c4fc2146359c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD9 5172 bytes
font_01_sfnt_off0000819d.bin
d212d5d82901219f63f2529c67c554c68c1774a28189332bc867440fb0777c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819D 10480 bytes

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