Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e52f5c896c1515b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-07 10:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ac735e2d6f5e0e05e7a99390e668ff SHA-1: 18e731c4be0835ba0245bee432b8c0ddedd96910 SHA-256: 5e52f5c896c1515b6fa1655a155827487739e0fa3b9ea7dde9b2a3bdcf0aefea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a free download for 'Bansal classes chemistry notes pdf free download'. This link, however, redirects to a known malicious redirector. The document also contains a large number of links to other PDFs, suggesting a link farm for SEO manipulation or to host further malicious content. 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=bansal+classes+chemistry+notes+pdf+free+download
    • http://fifobodub.doulasofomaha.com/uploads/1/3/1/4/131437812/9735949.pdf
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdf
    • http://files.eriedips.com/uploads/1/3/0/9/130969435/mulipuramunev-dufegatawikefiz-sexun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/hunter_x_hunter_149.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/95429020573.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/lawemosemegatatevubixeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/67870864727.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/muwowukopejegaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8506/files/search_fors.pdf
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/mozimup.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/40426846318.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/porenutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/zazotagekotimavakinozuwel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/warowopiwotu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f2b.bin
a690fca94268092112cad15213d0cdb331a147873782f9fe9ded3144633cb79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2B 5428 bytes
font_01_sfnt_off00006178.bin
bef87f0e96e9199a04145cdc385aee28e261f53aea628bf4311d06fcd8cd80fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 9944 bytes
font_02_sfnt_off00008392.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8392 4324 bytes

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