Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a4196a552fa851…

MALICIOUS

PDF

56.3 KB Created: 2020-09-01 12:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5617a03cb01bf52c3557eed01b64138 SHA-1: a119df78c2d97cb3098085e9e75445bb66c1c389 SHA-256: c7a4196a552fa851c9d5b57cdc2d8dce58980e8b282e9cd7feef90fbd79fed24
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for software downloads, specifically mentioning 'idle theme park mod apk revdl'. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, content.

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/wix?keyword=idle+theme+park+mod+apk+revdl
    • https://static.usrfiles.com/ugd/b8c837_3d459e0df3594179a2af038a8a62afd7.pdf
    • https://static.usrfiles.com/ugd/efb3f0_75d6650074cb4e5ea822b31115b8b7fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e39a787be1497a9b1ff2e3c267bea5.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_78e9ba33ecad4d09b21b522949f2a494.pdf
    • https://static.usrfiles.com/ugd/277b62_ffde195bf481497b880a6634cb38c411.pdf
    • https://static.usrfiles.com/ugd/8acad3_fa28e4c2a6b840fe8bbf02702c3cdeaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/5be868_fda4f89580524f67b1f012e730b3951d.pdf
    • https://static.usrfiles.com/ugd/9cc572_132b3c29890641cf8a98548cc5815bff.pdf
    • https://static.usrfiles.com/ugd/49be48_140077fad6c34f26be0d08a4ccf38790.pdf
    • https://static.usrfiles.com/ugd/eda9ba_323bd6da19df424d84303c6c86490a19.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/tezonesuwofekukabe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4188/8155/files/97336809567.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/53188707803.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/certificat_de_cession_de_vehicule_prefecture.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/ligemikemenad.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_off0000735e.bin
b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 2880 bytes
font_01_sfnt_off00007d9c.bin
b97b626ec774e205847bdb6d19c74e35f85d83e79a10ed97d13df736ad768991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9C 5080 bytes
font_02_sfnt_off00008eaf.bin
7733a1b525e284d45cada7dcbbbe50d7a4ed475b16757cc5c7cbd62d2432fe6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAF 2792 bytes
font_03_sfnt_off00009aae.bin
cae781e34a07af25ca453fccb81c74aa07c568243fa0707678a96367a47de166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAE 10488 bytes
font_04_sfnt_off0000bed7.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 16036 bytes

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