Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf335f08ba140fcd…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d0d700665950345da5f86dbdb3b2da SHA-1: a0f9b9430b1676411a7e8e679c85817f1f177cb1 SHA-256: bf335f08ba140fcd829f120c8ee882f97fbadf76e511ef09e5806275829d241c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though partially corrupted, contains a URL that mirrors the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the true malicious destination. 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=assessment+and+case+formulation+in+counselling+and+psychotherapy+pdf
    • http://files.killchain.org/uploads/1/3/1/3/131379743/7586001.pdf
    • http://files.anastasiaabrahim.com/uploads/1/3/1/0/131070737/eabeb0.pdf
    • http://files.artwalkstalbert.com/uploads/1/3/0/9/130969938/weburakoled_bukigojida_woput.pdf
    • http://files.pauldingcountyogs.org/uploads/1/3/0/7/130776739/5822437.pdf
    • http://buvabuwet.jdmdesigner.com/uploads/1/3/0/7/130775997/podamoxusurasom.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/72172010510.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/neoplasia_maligna_de_laringe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/94685060762.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/78043874868.pdf
    • https://cdn.shopify.com/s/files/1/0430/3277/2757/files/wepemuwodilasupupamidow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/wufaxeliv.pdf
    • https://cdn.shopify.com/s/files/1/0439/9477/5710/files/zopela.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/73134690632.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/74660866814.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/67950690659.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/periodontal_charting_form.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/wahlprogramm_afd_sachsen_anhalt_2020.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_off00006875.bin
47b208bda1b12f8df08e4872e31d5787da7261e6afcc676329ee3c53fcd7d190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 5660 bytes
font_01_sfnt_off00007b95.bin
9dd0de550ff410264d247f8ac38c75eb7e3eba6c059bad44c16c90b1c8bd1f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B95 10224 bytes

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