Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4b562d9267449f…

MALICIOUS

PDF

78.8 KB Created: 2020-08-10 19:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1896ac83e08f35146fcc77a9c2cf613b SHA-1: a6b6da8021c04668898813d7715b24dd40ddea71 SHA-256: 8b4b562d9267449f18fdac13b8e5c00a2522419c039d7f5452cd718fd80c0ba6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=electrical+engineering+drawing+cr+dargan+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=electrical+engineering+drawing+cr+dargan+pdf
    • http://files.kristysfineart.com/uploads/1/3/0/7/130775607/98397116870.pdf
    • http://files.supercoltguitars.com/uploads/1/3/1/4/131438188/teramesiben-bogeninezikiri.pdf
    • http://gutimopol.henrikbechseeberg.com/uploads/1/3/1/4/131406082/diziwirifejup.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/8368763836.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/dolawufajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/91986484014.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/think_like_a_man_free_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/catia_v5_surface_modelling_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/kotepeveduxox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/35578245100.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/89986334329.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/7139671813.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/tevuganefavefipogefil.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/business_intelligence_for_dummies_swain_scheps_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/ejercicios_condensadores_en_serie_y_paralelo.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_off0000e2bc.bin
8b2de3e4ebee95c0dc7092602f1252e2a806706fa276807b8178c5e1270843cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 5192 bytes
font_01_sfnt_off0000f485.bin
5de50a6d03967309a9f0afd01f5cf5c4c6ff672a17059b0533e6f795d8ca9418		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10144 bytes
font_02_sfnt_off0001174b.bin
e16707daab708f3d66031eb6687efba0cda950e88156e2d650207b89676e0106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16320 bytes

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