Malicious PDF — malware analysis report

Static analysis result for SHA-256 30231237c11e4aa5…

MALICIOUS

PDF

36.3 KB Created: 2020-08-01 22:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd04cc9709f9d1737e28ac594b25c34 SHA-1: 0124e4050702e5aa81866ea719656decd3ca415a SHA-256: 30231237c11e4aa5db2ee1c66a9b12b5d35dfb39db6cde4ae71e92f640110e86
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external PDF links. One of these links, https://ttraff.com/pify?keyword=heartsaver+cpr+aed+student+workbook+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the same URL, suggesting it's part of 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.com/pify?keyword=heartsaver+cpr+aed+student+workbook+pdf
    • http://files.kdmetroeast.com/uploads/1/3/1/4/131437236/lubavovipof.pdf
    • http://files.colonialbaptistbradenton.com/uploads/1/3/1/6/131636972/nakev-nevarewaragim.pdf
    • http://files.rshroff.com/uploads/1/3/0/7/130739069/dudapubap-fexugakumetaza-batodalo.pdf
    • http://files.ctesaisd.org/uploads/1/3/1/4/131437523/giwefifudepagadas.pdf
    • http://files.stannesbirmingham.com/uploads/1/3/0/7/130740530/57990.pdf
    • https://cdn.shopify.com/s/files/1/0440/0162/4214/files/runescape_bots_2015.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/87663437601.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/mumeviw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/94684758404.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/16557212633.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/besagemuwakewakivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/kuvarizexatikumadanos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/85846148990.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/kenafomedeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/280680.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/24510030634.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/lezipunekekegoxavenagixem.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_off00004e3c.bin
79ac25698467ebeb1dc2a00faa670fd7cf172ab0283555b8aee47ba04f485a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3C 5432 bytes
font_01_sfnt_off000060d9.bin
301abba80dd374e52d307d18e6c7006728083825c4b7433499945b5345c148b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 10528 bytes

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