Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15295d0230a9b1a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-07 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a1779b49f2b5acde1cea22e3b2a867 SHA-1: 371a2f1ce183a33465cf92b6414860d153ce21e2 SHA-256: b15295d0230a9b1a62f1dee11461704aabef7f60c15a69674a42b5ff4e0b4aab
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely the primary malicious payload delivery mechanism. The document body, though partially corrupted, contains the same lure text and URLs, reinforcing the malicious intent. No scripts were extracted from this sample.

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=ayurveda+books+pdf+free
    • http://files.fccbluffcity.com/uploads/1/3/0/8/130874522/pazawe_vuxisumu.pdf
    • http://files.psalmstre.net/uploads/1/3/0/8/130874250/0b73356.pdf
    • http://files.naturalme4c.com/uploads/1/3/1/3/131398188/konafesexudato-tazajexi-varibona.pdf
    • http://mimevab.physiciansprimarycare.org/uploads/1/3/1/0/131070374/kinexojupopiber.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/sublime_text_html_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3252/files/calculus_2_paul_dawkins.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/pikedapur.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/saxipekifigim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/fodikatofupaxolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/78930996406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/xinajawutujotolakav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/41669110688.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/18589454405.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/katesafosituvazotelujar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/45334608255.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/zobunenarowadusagipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/pathfinder_unchained_monk.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_off00005a96.bin
6a3ccc661c64ca99dcbd89767c83e50a9f049a13157d68fc6a2705c5f44ddba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 5360 bytes
font_01_sfnt_off00006ced.bin
ac6067b857fd8da542c22d59c942f62688a1a729fe62413f8994524c8c7614be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 14092 bytes

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