Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa2adb5534b9e76…

MALICIOUS

PDF

41.7 KB Created: 2020-08-17 03:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e278ba23742ca151bf7a3681f8c78c4f SHA-1: c8136790f6043eba09a680323d814e8ef2733b74 SHA-256: cfa2adb5534b9e76f09bd22eaf94252ce67051a31af4307f80af7078e5b617c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised with a search query for 'Batman dark knight rises free'. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to a link farm hosted on Shopify. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/pify?keyword=batman+dark+knight+rises+free
    • http://files.shirtkingzcustom.com/uploads/1/3/2/8/132814371/duwobokumovuwu-sadifadudebo.pdf
    • http://files.nikkicshairstudio.com/uploads/1/3/1/4/131407705/wujise-voduvewetu-doresi.pdf
    • http://files.finefoliage.com.au/uploads/1/3/0/8/130874240/wabifuperozukaw-gapovazejepexu-riwogusunofil-ruroposisimozej.pdf
    • http://veweb.keeptheflame.net/uploads/1/3/1/4/131454165/4f10e2310d9.pdf
    • http://baminap.nentraining.com/uploads/1/3/0/8/130873947/fujiropexebumivamif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4732/0728/files/pathfinder_magnimar_city_of_monuments.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0536/files/wasuxuxuvizedad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijufetibumumupaxewaromuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/jipafonuletesolex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0449/7974/9022/files/duties_of_a_personal_assistant_to_the_managing_director.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/jurnal_akuntansi_keuangan_issn.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/7810780681.pdf
    • https://cdn.shopify.com/s/files/1/0431/9153/3725/files/juvenafuratibevujik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7702/files/86263689131.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_off0000640a.bin
7084cb8e992ec1bf660e4b557e55673d0cd0d6bc9a69d668801a7be21943ccfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 5400 bytes
font_01_sfnt_off0000763d.bin
108f5651cba6eead55988aeea5f14c0a0b57f8606971e92f750cea41b922e0dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763D 10348 bytes

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