Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1baf3f14cbd03d…

MALICIOUS

PDF

45.9 KB Created: 2020-08-11 17:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3661e4ee826f62a907187f89768aa17a SHA-1: 269e78b33b4cc5dcd94ea24257dad51ecf1d2241 SHA-256: bf1baf3f14cbd03d7472b41affe95db91c1152a272e4c0ad6ef86f7e220e9d7f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the malicious URL, suggesting a lure to a potentially harmful site. No scripts were extracted from this sample.

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/wb?keyword=matador%206%20burner%20hooded%20boss%20bbq%20kitchen%20manual
    • http://files.greaterpittsburghquickcash.com/uploads/1/3/1/4/131438316/2839197.pdf
    • http://files.almosthomecaninerescue.com/uploads/1/3/1/4/131453267/63448b4ff.pdf
    • http://files.move-or-stay.com/uploads/1/3/0/8/130813781/vunobemezosuxupo.pdf
    • http://supijune.gracesocialsector.com/uploads/1/3/1/4/131482952/jafumamawu.pdf
    • http://files.bygardensgrace.com/uploads/1/3/2/6/132683130/topafoxisudo_zarivoveb_lopatimi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/employment_news_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/bowflex_workout_plans.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5581/files/42817589062.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/56648887437.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6848/files/30697027659.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/nulitilugoguforomib.pdf
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/35315575789.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/xexolisamoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/1060/4705/files/vehicle_dynamics_gillespie_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7075/8820/files/45667948210.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/sociology_book_for_css.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/79247891552.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/bitavimakudabimu.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_off000072b2.bin
8344da6d38b4d74d9e4f477848039e71de436f3e19632f6ffadf4e2b20a61463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 5668 bytes
font_01_sfnt_off000085c9.bin
d9688f4fc27033e00b1b688acda9c87719858bae808c19d9937db96428f9760d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 10744 bytes

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