Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a843fcee287d3…

MALICIOUS

PDF

58.6 KB Created: 2020-08-07 18:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95d1edb3c9fdc77c464f91da754a5d4 SHA-1: fabbb50f616086ed2e214f9ca53fd063c2347b7a SHA-256: b24a843fcee287d3b9fe8763b0b3fdb500ae8a84af5b5c963d5a98f4e5593b86
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=cateterismo+intermitente+limpio+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The document body, though heavily obfuscated, contains the same suspicious URL. The primary attack pattern involves luring the user to click these links, which likely lead to phishing pages or malware downloads.

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.com/pify?keyword=cateterismo+intermitente+limpio+pdf
    • http://files.membraneemulsification.com/uploads/1/3/1/4/131483020/4952308.pdf
    • http://bagigulo.bloomclothingcompany.com/uploads/1/3/1/3/131380729/897638.pdf
    • http://baxiluw.engagementlearningpress.com/uploads/1/3/1/3/131383297/28fb051.pdf
    • http://files.savethewindmillpub.com/uploads/1/3/2/7/132740536/095453ac.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/49186772664.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/jafakukebejifigewaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0380/4839/files/dojivodubuvisijogujilij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/gixebaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/begawobonozurumadudez.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/kanivaruzovuvoxelemajumop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/37944349281.pdf
    • https://cdn.shopify.com/s/files/1/0447/8078/1719/files/biogeography_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/pasexoravupewozuregapotuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/sibasudatojazisodopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/48638699446.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/agents_of_socialization_in_sociology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009056.bin
8c2e4d749ceec18dcf292e0d97382690c44949c0bdcbe8c967f7b853a8635b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9056 5092 bytes
font_01_sfnt_off0000a18b.bin
f27ee977517de7dcd07e0602f447083d3ac5b113e6778bc123bb545f561c26c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA18B 11264 bytes
font_02_sfnt_off0000c657.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 16148 bytes

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