Malicious PDF — malware analysis report

Static analysis result for SHA-256 7843934ddea4359e…

MALICIOUS

PDF

35.7 KB Created: 2020-08-03 16:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4669285373c441556761eb6d9e6e315e SHA-1: f0b3cb7a174fd80ceb816f6ee064cc8a67a0b2cd SHA-256: 7843934ddea4359e58da12fd11a5f74ef9a15690a88c24f9d740a0b18340fd02
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a malicious redirector disguised as a workbook download. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The document body, though partially corrupted, contains text related to the lure and a URL that leads to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ags+algebra+1+workbook+pdf
    • http://files.alanhockett.co.uk/uploads/1/3/1/4/131406075/piniwakeredo.pdf
    • http://denuri.lksandassociates.com/uploads/1/3/2/6/132695492/d10a9f.pdf
    • http://files.observationsandconclusions.com/uploads/1/3/1/1/131164424/499063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/11512414772.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/fulejekimidudefoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/35690786909.pdf
    • https://cdn.shopify.com/s/files/1/0431/2304/8609/files/28644449163.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/61399575665.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/53805868081.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/rowajazol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0912/files/vilugovanudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/dopowupinijuxupomojulevo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/12977709133.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/gadutamugodan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2512/0927/files/jotajuzaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/53975165609.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/tonozaxakafizuwo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d19.bin
66daa7ae7a2b65fcb95b5e3436a880e1e284cac1f378979a1180a75027c91fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D19 5548 bytes
font_01_sfnt_off0000601c.bin
37e9007348e623a24b907378ad8663abf386db3c83505d6452541a1e0b367e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 9984 bytes

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