Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6476be890339581…

MALICIOUS

PDF

41.4 KB Created: 2020-08-23 01:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36e4079885330f39c8b27d51682bc96a SHA-1: a832e4c6664494705429ac165a0a0f6177cbebd1 SHA-256: d6476be8903395812ba9dc191dfaec335d5b2eaeb9671bb4c00039235091e2c8
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=food+and+beverage+cost+control+pdf', is designed to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely for traffic redirection or phishing.

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=food+and+beverage+cost+control+pdf
    • http://lotofi.visaliaobgyn.org/uploads/1/3/0/8/130874388/b7e31f489713c.pdf
    • http://files.madisonbizreview.com/uploads/1/3/1/0/131070246/1cb15729a.pdf
    • http://files.cotamtb.com/uploads/1/3/2/6/132681647/8296b.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/arms_and_the_man_bernard_shaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/bodmas_full_form_in_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1723/9704/files/puban.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/vefexuruzunosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0457/5387/files/follow_guidelines_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0438/6576/8096/files/gotoxewuxilifaresejopoji.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/passport_application_form_for_baby_canada.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/611921783.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_off000062e9.bin
daf52c4e02e9f2134fef2a38f4c4fec4ed2da5fba64615ccb6974d1d155a0b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 5476 bytes
font_01_sfnt_off000075a5.bin
55c9c60c2135197eb8d1c1ae68a448c15352ebdc08f4d2e2a947788284edf9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A5 10376 bytes

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