Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3dbcf8eee9327c…

MALICIOUS

PDF

48.9 KB Created: 2020-08-05 08:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5660c5cc9914e6d5561df6bd44f295 SHA-1: ee85c6a268cb16474717a92a57c9dade96345411 SHA-256: 6f3dbcf8eee9327c618e98876d719ff794b2a3e44234edf4ff0ca8e3ad601994
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=boxster+buyer+s+guide+pdf
    • http://files.garyboydconsulting.com/uploads/1/3/1/0/131070351/6897195.pdf
    • http://naxefiz.stickyearth.net/uploads/1/3/1/0/131070152/6405098.pdf
    • http://files.slowmusic.pl/uploads/1/3/1/3/131380308/1878492.pdf
    • http://fulib.southcentralsetac.com/uploads/1/3/2/6/132681504/7867545.pdf
    • http://files.lucymayphotography.com/uploads/1/3/0/7/130776162/gotebigepas_xiwajurowiriwi_tavuwuwom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/jutedagegoladibusoxuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/5008/1183/files/pt_cruiser_forums.pdf
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/9859318205.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0865/files/how_to_resize_an_image_in_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0437/3299/2161/files/12524615088.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/57075908917.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/51333034446.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/37814221014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/nudoxefuxiwojinoneloba.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/gaxiwafafewef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/tabovakupupumamodejasog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/webojajisurefakotazow.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008104.bin
99d63b1f506c1ec1663983ceaa4a3c749d5364868d5dc24a80b94e128c318884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8104 5324 bytes
font_01_sfnt_off0000933c.bin
4b5543083c2bcd1b169c5d8274422a39343142f43b1abb49756576d711012678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933C 10420 bytes

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