Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6494374b5dce576…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca7db7d8098119334ad265026c037f4 SHA-1: e52c4388931cd711013024aeb3a1373535094022 SHA-256: d6494374b5dce576b3090b15d14141840f44f88454ed753163ba9381fa501913
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates that the document is part of a link farm, likely intended to manipulate search engine results or distribute malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests a delivery mechanism for further malicious content.

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/wix?keyword=jeopardy+powerpoint+template+for+ipad
    • https://static.usrfiles.com/ugd/b8c837_1dfe8f8888b8491f80ea938412e789d6.pdf
    • https://static.usrfiles.com/ugd/913720_1f8104e34ef0476fab6dfd0daa0e3130.pdf
    • https://static.usrfiles.com/ugd/b8c837_eccb0b54df924fa4ba0bf46874c9902f.pdf
    • https://static.usrfiles.com/ugd/d5415a_fb92b0a20f034226875daff7c5fb49e6.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3501/files/dont_you_worry_bout_a_thing_tori_kelly.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/52516202649.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/vovovavukujeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/rubber_sheet_for_baby_bath.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/plant_based_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/formal_letter_address_template.pdf
    • https://cdn.shopify.com/s/files/1/0462/8411/2032/files/facebook_cover_page_psd_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4958/1730/files/kidosamuledomoxomogeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1615/8359/files/biology_imp_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/81358963189.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/suvugojixilejigejab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0711/4391/files/56043864795.pdf
    • https://cdn.shopify.com/s/files/1/0430/7864/7957/files/732188106.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_off000085e3.bin
ed629ca866ccbbea99a8fa6ef1da1e1d15cb5e467bf516ddc4eeba3a172bded6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E3 5192 bytes
font_01_sfnt_off00009798.bin
5dbe37d5637db5142a94fedca5ecd1d5be14caaa8b9877c21471882611e2115f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9798 12040 bytes

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