Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a2ba85d311cf66…

MALICIOUS

PDF

46.8 KB Created: 2020-08-12 07:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6790f5b072826f6813d0dc420a4301a SHA-1: 8eebb85b5b48f6565dde33095144242bfb583c17 SHA-256: 35a2ba85d311cf6637de1a63a335e26f8d2fca13fcc13f936a15736e7ef51509
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=definition+of+technology+in+education+pdf
    • http://files.sebaacademyschool.com/uploads/1/3/0/7/130775588/08f0e1c0d3ce470.pdf
    • http://files.krgriffiths.org/uploads/1/3/0/8/130874129/96dffd9.pdf
    • http://files.danhegstad.com/uploads/1/3/0/7/130739731/gedosekil_fisulapejaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/91251949920.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/46241097806.pdf
    • https://cdn.shopify.com/s/files/1/0429/4321/7830/files/cefuroxime_davis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/hyperbole_and_personification_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5472/6310/files/23416871013.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/ganewobevuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/wutang_clan_gravel_pit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/fe_mechanical_review_manual_2014.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/zuvejonefojoxajal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/18759344649.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/fanosasujubupakazevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/sijixewovofajamelewosupem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/95920082155.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_off00006ab3.bin
6bc83ecbb186b293205e5ca22ac21e2df3b8b6f154191a5a031226f869bd5601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 5128 bytes
font_01_sfnt_off00007c30.bin
056c345073fb015888656d65b8a6677e9b0ef14cd0da17d0d0417dc16b2a5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 10496 bytes
font_02_sfnt_off00009ff4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF4 4324 bytes

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