Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9baaa6945d609f6…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 04:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38bf4d97a3a5aef73ffe0be4cf9aeb30 SHA-1: a36b29a4be2dc9e3a4f24b56efb3bebebe26ef85 SHA-256: b9baaa6945d609f646a921f81d2ec5b69ebe2704898beb333d9f053d4b0adc02
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector, ttraff.com, with a query parameter suggesting a resume template lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious infrastructure.

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.com/pify?keyword=accounts+receivable+manager+resume+template
    • http://files.lawlorgallery.net/uploads/1/3/2/6/132681771/6894419.pdf
    • http://files.elyallotmentsandgardens.org/uploads/1/3/0/7/130739570/7550291.pdf
    • http://files.farmcounty.com/uploads/1/3/1/3/131398351/gonibitivapela-volutujejaguw-ruweridipog.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/reduced_adverb_clauses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/affaire_cahuzac.pdf
    • https://cdn.shopify.com/s/files/1/0440/4084/7510/files/bivigigudoxiron.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/seismic_data_processing.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/68031663596.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/3564396998.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/kupinawasadizotiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/asean_outlook_2020.pdf
    • https://cdn.shopify.com/s/files/1/0452/4598/9026/files/search_a_on_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/bevunajigupafaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/99058862277.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/antimicrobial_activity_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/39386075396.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_off000060aa.bin
261fb3c058b980627383294d779a218d8d8e07429172824a6019adbbabcaee44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 5444 bytes
font_01_sfnt_off0000731b.bin
9a77f9eda201dad4fe9588bb5a6526d90bb562539b9bf7fac79a28a4bb44f067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 10596 bytes

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