Malicious PDF — malware analysis report

Static analysis result for SHA-256 bade3a7271c1b28f…

MALICIOUS

PDF

53.5 KB Created: 2020-08-08 11:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a0558900509bcd29e82bbddd0e23f4 SHA-1: be160bfb17603af804569f20aa6b724fe5518970 SHA-256: bade3a7271c1b28fc3fdcbdfc9127c7f7276513135459297776f3446082ab8b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=scrum+guide+pdf'. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The ML classifier 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.cc/pify?keyword=scrum+guide+pdf
    • http://files.santiagolopezphoto.com/uploads/1/3/0/7/130776460/lizisiwamisi.pdf
    • http://files.azlife.church/uploads/1/3/1/8/131872055/6441081.pdf
    • http://nipajixo.5keysyoga.com/uploads/1/3/2/6/132696414/wuzus-dirikevopazu-zeluvimujabobi-dafufisuga.pdf
    • http://files.12stonesmoldcleaning.com/uploads/1/3/0/8/130814066/redorozuviduba.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/76157060460.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/monesivogig.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/63398378286.pdf
    • https://cdn.shopify.com/s/files/1/0439/9602/0894/files/american_english_file_3_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/realtor_com_api.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/nyc_rent_stabilized_lease.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/fipokija.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/sobupisuzigunebimuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/42453539339.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/64647067826.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/vogexoxoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/nawaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/honda_crv_air_conditioning_recalls.pdf
    • https://cdn.shopify.com/s/files/1/0445/6385/7572/files/goal_2_full_movie.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008941.bin
a0a7dd3bce81a0b48b8a89f9afde40ccec903d5d592df0d40dffe00a98d64a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8941 5156 bytes
font_01_sfnt_off00009ab9.bin
e255203c8244fa5b9cdc9eade825e55d0b811a5909be6ba62f7d23ecbd5d37f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB9 15060 bytes

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