Malicious PDF — malware analysis report

Static analysis result for SHA-256 166875f09cf9ce18…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 04:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e9d743f4f523b6b2661368a3b926ca4 SHA-1: d08adc55c221f4b1138cd73ffeb1ead67b14c1f6 SHA-256: 166875f09cf9ce18790308ba8ffa65811f09b96e9388c03ad9fe125135b15845
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of using link farms to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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=reading+assessment+tools+pdf
    • http://files.cgpto.org/uploads/1/3/1/8/131871963/pulivuj.pdf
    • http://mofakijis.ktharrington.com/uploads/1/3/0/7/130740596/db883.pdf
    • http://serim.johnreidpe.com/uploads/1/3/0/9/130969356/nejuvipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/nonufipotidefubovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/47925072231.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/27014976654.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/new_levels_asap.pdf
    • https://cdn.shopify.com/s/files/1/0440/7066/6390/files/dufulodilomuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/10481678864.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/dikil.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/nifisako.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/giferepigiluze.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/pepokakabowitivobogitabu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6408/0024/files/norma_tecnica_de_anemia_2020_minsa_peru.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/rodipuvola.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/52921267037.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/kugupel.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_off00006149.bin
970d2fbb627d555ada55d0c576ac29f5a9175d8440bb372f32cc9294d20b834c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 5060 bytes
font_01_sfnt_off00007272.bin
c50eb0dec06920aaf9ab9dc62c760a939c35a20068213b353716c8309979fa37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7272 10096 bytes
font_02_sfnt_off000094e9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E9 4324 bytes

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