Malicious PDF — malware analysis report

Static analysis result for SHA-256 237e03d2ebf8e8cb…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 20:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ea318a292ce4b2da4ea91932065088 SHA-1: a0795adb51dbea0296d112a54e43ee9c314610a7 SHA-256: 237e03d2ebf8e8cb621cb33bd7d21d681abe4d5f9dbd2fb8b767be4ba77fdad6
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links, suggesting a link farm or SEO poisoning tactic to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=exercises+for+thoracic+back+pain+pdf
    • http://files.renaissancefrau.com/uploads/1/3/2/3/132302735/d0bec.pdf
    • http://files.stephenskitchenandcatering.com/uploads/1/3/1/8/131871864/pejirezev_pikoreso_buvivigo.pdf
    • http://files.wblhoa.org/uploads/1/3/1/4/131453618/wobuxe-bufuwisemotaloz.pdf
    • http://dowixazun.laughingmoondesigns.net/uploads/1/3/0/9/130969368/zufufixibaxapuk_jukeravoliwu_wevetovosidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/rang_and_dale_s_pharmacology.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/76998235161.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/kogolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19441108854.pdf
    • https://cdn.shopify.com/s/files/1/0452/6581/3666/files/31431832549.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/jigepitumubosore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/32485657154.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/telefavosalezovumose.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/67493857781.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/swash_plate_piston_pump.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/zudamivob.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/89227576537.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/kenoletikarolavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/kuputobovirapire.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_off00007435.bin
bfe42d78c362bae16843117d8a126d9392c67d2dd7933d1a9c73e36fd1dd3c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 5440 bytes
font_01_sfnt_off000086a7.bin
7fd70e3567e2d816d132f6dfc0dcc506fd1f26e07f4da48d55e67d37fc529c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A7 10176 bytes

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