Malicious PDF — malware analysis report

Static analysis result for SHA-256 855aea2d06b831fe…

MALICIOUS

PDF

96.9 KB Created: 2020-08-31 00:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9783bc2472091782323d80f268d200 SHA-1: 8351492e42dda899260b00dab4c4111fcffa4238 SHA-256: 855aea2d06b831fe756c73090d130ad7f03e882d55decc2f5c83661ad28736d7
152 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.com/wix?keyword=terraria+boss+health+bar+mod'. Additionally, it exhibits a PDF link farm behavior, with numerous links hosted on 'static.usrfiles.com', some of which are classified as confirmed benign but the overall pattern suggests malicious intent. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=terraria+boss+health+bar+mod
    • https://static.usrfiles.com/ugd/2f8cea_dc9c5de44f984f0fbacf24240fabae63.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.pdf
    • https://static.usrfiles.com/ugd/d216cb_8313cb7668f54868859d32c1842f69c8.pdf
    • https://static.usrfiles.com/ugd/9e41f0_6be24ea2dbe5487ab93ebd92f764e311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/ruteterufabel.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f5de14617d5407e8f4c54e057b94155.pdf
    • https://static.usrfiles.com/ugd/764aaa_fa6f21eef61e44849b04769c449d29a7.pdf
    • https://static.usrfiles.com/ugd/8b9728_c69b286e75ab4d6597bca1f5ac9ea5d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_18454bd4b1a940c69a2745f16d8d8ce5.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/posemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/tevij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/irony_worksheet_5_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/printable_calendar_2016-_2017.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/wuvuvegonixenufaji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001217e.bin
0bb8d8157a8449fa68ddd10ee391bea191e9b104dd6b9851d54777f6e1518770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 5156 bytes
font_01_sfnt_off000132d3.bin
739c3d9b2d47a2cfad33e60e0e9c90126dcf78ef095a7abc90bbb739ab0937f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 14140 bytes
font_02_sfnt_off000160a1.bin
81e53d5140c5c9ed498a6e0a35677eec61c648c251b3949e9ea50ab5a87aa89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160A1 16168 bytes

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