Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d324f5f54c1d027…

MALICIOUS

PDF

48.4 KB Created: 2020-10-02 01:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfaefc0638a6b02b9f2ec02f7a6dffbe SHA-1: dbb3b2120fe5e8b89de18d19db758059fdb1fe6b SHA-256: 5d324f5f54c1d027627bb0f95a1d634045a9cd8c3874b65f8579f2dbcb2d850a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the pattern of the malicious links.

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://cctraff.ru/pify?keyword=18th+century+dress+layers
    • http://files.tilleyrent.com/uploads/1/3/1/4/131437318/5183bec6a03e58e.pdf
    • http://vowawi.linemantrainer.com/uploads/1/3/1/4/131406925/8051075.pdf
    • http://sutijope.camileaccessories.shop/uploads/1/3/0/9/130969541/eeacb0826b2ae.pdf
    • http://dajug.stjosephsglenealy.com/uploads/1/3/2/6/132695643/jatesinerogad-fasixejejo-petivoj.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://files.cngwritersink.com/uploads/1/3/0/7/130776211/0d61b407d.pdf
    • http://files.mccallsferryfarm.com/uploads/1/3/0/7/130775623/movurovusofu-kekavuso-juzaliwekara-satomisowokeguj.pdf
    • http://didat.kolbyvancamp.com/uploads/1/3/0/7/130740537/katugaraxozepatagibo.pdf
    • http://kudirebef.twindphoto.com/uploads/1/3/0/8/130874408/xufasobudefi_vopetuzapowar_pulemasok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/70e7a389-042a-43f5-9198-48d3f29d92f1/88756761232.pdf
    • https://uploads.strikinglycdn.com/files/c7b8efbe-31fc-4efc-ad0f-c9daa300dbfa/2188596740.pdf
    • https://uploads.strikinglycdn.com/files/209fbcd8-1124-40a5-89c6-9e52c21a0ece/petixivezetewokirib.pdf
    • https://uploads.strikinglycdn.com/files/40aeaf54-50be-4440-9305-42ed09d19ba3/sironadel.pdf
    • https://uploads.strikinglycdn.com/files/43cab35d-6a5c-47b3-b17e-79eb03299e23/soxofomebo.pdf
    • https://uploads.strikinglycdn.com/files/8d066703-90b8-44ea-84ae-950483850162/14060663128.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007248.bin
8073522b80bda6329cc7c39cfa0eb5a84d352c9086c6433d7424366b2ecc5bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 5004 bytes
font_01_sfnt_off0000833f.bin
d9bfc835ece07eed66530e5bc3d625e78a91e5c760b3522c07e9d10f492a88a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833F 10308 bytes
font_02_sfnt_off0000a68a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA68A 4324 bytes

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