Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d41633b5da0c38…

MALICIOUS

PDF

68.7 KB Created: 2020-08-07 20:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 418d4f3b9f1c4436d4572e183d5597f9 SHA-1: 83d2e603c4dcad64bb11ed0e845d890ab0cfb0ca SHA-256: 12d41633b5da0c389f54b6dfe38f1d647681276c31528602f5bdda196ebc564e
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs, with one primary URL identified as a malicious redirector. This suggests a phishing or spam campaign aiming to drive traffic to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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=religious+and+moral+education+definition+pdf
    • http://files.cordovaswitnesses.com/uploads/1/3/0/8/130874110/5027452.pdf
    • http://files.hoggiesnetball.com.au/uploads/1/3/0/7/130775276/jinozemude.pdf
    • http://files.dallaswhite.net/uploads/1/3/1/4/131455621/62529.pdf
    • http://files.bejoyceful.com/uploads/1/3/0/7/130739986/rulubomarovizu_ripori_xajejalimow_vuzerurat.pdf
    • http://files.mmeramirez.com/uploads/1/3/0/7/130776503/9758433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/fusupiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/63077298738.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2375/files/36570117655.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/31545968832.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/41483646942.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/xemeba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/kologemibalunurimaferi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/2020472379.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/tijovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/likugepavile.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_off0000ab80.bin
d6dffa074578da5e92e9d2e5e10ed2f12690d298b140a1cf58e6bfba6a64be56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB80 8432 bytes
font_01_sfnt_off0000c7b4.bin
8090fe83c0de1d949ed4bc7aabf61069431e56da38ccd29dea339233cbc2a9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5484 bytes
font_02_sfnt_off0000da4e.bin
e50270ece7c3e051002287b7df228caab5f1f9f78e55db16bfbeecb8d39e3951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 13376 bytes

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