Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e4a7a21aee261b…

MALICIOUS

PDF

34.9 KB Created: 2020-08-17 15:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8b5584ac324b1cd4c4827ef118e970 SHA-1: 6b9ef5de1fcc8ff011b31b353de8381f3456de45 SHA-256: e1e4a7a21aee261b5522e80d28f76cc97ab81225240ae7308600bfe6547f34f4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=orthographic+drawing+exercises+with+answers+pdf'. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to drawing exercises and the redirector URL, reinforcing the lure.

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=orthographic+drawing+exercises+with+answers+pdf
    • http://files.newbornschoolhouse.org/uploads/1/3/1/4/131438003/nixubigesav.pdf
    • http://katafi.bridgestoserbia.com/uploads/1/3/1/0/131071021/rokeworaxusipominaga.pdf
    • http://files.deespassionateworld.com/uploads/1/3/1/4/131453252/zamowawimilo.pdf
    • http://kakoju.platinumgraphics.org/uploads/1/3/0/7/130776262/c68e643e0e9.pdf
    • http://files.figman.com/uploads/1/3/2/3/132302951/kejifeje.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/bekaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/62681540099.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/caderno_caligrafia_artistica.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/70921014840.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/xamogugerivesumekunamegat.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7820/files/49041066037.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/mixuzafut.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/vopagonuxanujolazojijum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/70700899829.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/48290360335.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/how_to_solve_a_slide_puzzle.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_off0000495e.bin
c63e796eb4b3a7e6724daa0bead9b874c35094567e2796f318a55ea45bd13a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x495E 5572 bytes
font_01_sfnt_off00005c6a.bin
4172490abd3dee713d83bec8b5c29ab6fe8c07ee054856cfac6b48263a5b3878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6A 9948 bytes

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