Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb25875c981cee8…

MALICIOUS

PDF

38.5 KB Created: 2020-08-10 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da76b1c0ce45ad67a10a8082e4dba9f SHA-1: baa2a0b30f59a74c5362cb4959ff2ac4a932e952 SHA-256: 0bb25875c981cee838fa577966756e8ee8ce73ec98ed4378d209b9cbc5ce8e10
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. This suggests the document is designed to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=birmingham+train+map+pdf
    • http://jilubuxe.bayridgerescuesquad.com/uploads/1/3/0/7/130775904/tuzep_pazurux.pdf
    • http://podubed.essentialhealthsantacruz.com/uploads/1/3/0/8/130874038/4353879.pdf
    • http://files.wrrbc.org/uploads/1/3/1/3/131383478/0ad9e3.pdf
    • http://files.susansharpesphotography.com/uploads/1/3/2/8/132814996/jeziwunit-pomesajozofidi-vimufizido-mezupel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/common_idiomatic_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/cookie_clicker_save_editor.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6260/files/pepukaforoduba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/venizolebaveni.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/golozefetanuteku.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/65660485884.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/gamijazitukelokefamovigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rakapadanixip.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/83295521300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/naxuzesifulibutosutalo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/minazatemawe.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_off00004c5f.bin
8f0597b94dec96fd6b7e042ed1f66a83cac7a9e5cbb75ac72cc898bc75d97e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5F 4856 bytes
font_01_sfnt_off00005ca1.bin
73634c942dfedec076a0c6ff11bc792a4c58a9d04e5bfad01777de9152151b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA1 10016 bytes
font_02_sfnt_off00007ed4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 4324 bytes

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