Malicious PDF — malware analysis report

Static analysis result for SHA-256 287ed69dc4940d11…

MALICIOUS

PDF

54.7 KB Created: 2020-04-23 19:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2daaa226bc099ae0ca84c4d6cb33d390 SHA-1: 0fd3417fa23e81f8786ad3d1ebea8e711d1fe6d2 SHA-256: 287ed69dc4940d11821c973885e311d8b28cc3240f510d7427e70c61ff3e852e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a lure related to makeup, but the primary malicious activity detected is the presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. This suggests the document is designed to manipulate search engine results or redirect users to potentially malicious content hosted on various domains. No scripts were extracted, and the document body itself is heavily obfuscated, making it difficult to determine the exact payload or intent beyond link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://revesq.org/uploads/1/3/1/6/131607486/131607486.html#makeup+revolution+concealer+shade+guide
    • http://reclaimeddesignworks.net/uploads/1/3/0/6/130604140/nimaderipo-niluripenuwa.pdf
    • http://thetravelinggentlehygienist.com/uploads/1/3/0/8/130815140/5186283.pdf
    • http://mh-aero.de/uploads/1/3/0/7/130775518/bavizegukabovapa.pdf
    • http://saltsentry.com/uploads/1/3/0/7/130739827/bd970d2a15af7.pdf
    • http://the101net.com/uploads/1/3/0/4/130475909/rofit-sutemeva.pdf
    • http://osestate.org/uploads/1/3/0/6/130639762/jatofat-rupesibiwok-lavisuxafexiji-fuxinuru.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_off00008c4d.bin
9a68975dff1548482fbb3c192382a61f664f5f07808f4f30de17a220717b0490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4D 8928 bytes
font_01_sfnt_off0000ae61.bin
f89c0e0946aa0d1e48aa5356a2d31bc24f5b96ca1f2cb84330b25817f6444d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE61 2024 bytes
font_02_sfnt_off0000b7d2.bin
2d9a456853fe6c0446581e4563fb8dc4b722e0b2c528c521fed10db478da25d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 16108 bytes

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