Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc291b8c6fdd838b…

MALICIOUS

PDF

49.4 KB Created: 2020-08-07 13:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb311f1311870875bdd4492c75125696 SHA-1: b3b0ccf88faf1e132811b44f01db60a29f34030b SHA-256: cc291b8c6fdd838b284ad5b4e6899d8bc374a988e654cf5564a4b7b31295ea3a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL points to a redirector service, likely intended to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack to drive traffic to malicious infrastructure.

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=marriage+d+amour+guitar+pdf
    • http://tekudag.didintle.online/uploads/1/3/1/3/131398140/woropogukaraga.pdf
    • http://wunaziser.onelasalle.com/uploads/1/3/0/7/130775971/kanadaxubivived_tasimukilexiven.pdf
    • http://files.cherokeeband.org/uploads/1/3/1/4/131453097/lerekuzi_subijen_lulutawiw.pdf
    • http://files.miscellaneoussushi.com/uploads/1/3/0/8/130814017/nejexirove-pujozivopemim-papipipuxiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/xinexiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/jawubaxoguruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/interview_questions_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/vbox_kernel_driver_not_installed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/luzowalewagek.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/foritugavugujewifexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/26783981228.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/nixisofujitipadupubaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/reading_and_writing_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/ielts_academic_writing_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/fixikatavutinole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.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_off000073ab.bin
d5bd923b6000f924ba7764c89396bb6f404b1cad2d823df956d5f9f3be1fd418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AB 5156 bytes
font_01_sfnt_off0000852b.bin
586a36b2b6d4f8f1b176c74d299e8fad59de9c1b0fbe341d17968d639ff795e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852B 16120 bytes

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