Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cd6b44d9f97e70…

MALICIOUS

PDF

75.3 KB Created: 2020-07-28 01:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb2208cd743e30e43d72057e47978fc SHA-1: a6b2e94a4a1f4a223f6b90e06d74cc9ca7861cdb SHA-256: d8cd6b44d9f97e702b69c1e8a3a9f471d8f42971cd92f17c18a37090d2ffe723
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com and a redirector on ttraff.ru. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to admission guides, intended to trick users into clicking the malicious links.

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=amu+nri+admission+guide
    • http://files.promisewed.com/uploads/1/3/1/4/131437276/jegur-wajokumitomu-xovegiposisafi-rebekuk.pdf
    • http://files.finleydesignart.com/uploads/1/3/0/9/130969981/1880772.pdf
    • http://files.nobleprincess.com/uploads/1/3/2/6/132695294/1343ce2ec.pdf
    • http://files.multiculturalvirtualexperience.com/uploads/1/3/2/6/132695782/duzuwabosi.pdf
    • http://files.patokavalleycte.com/uploads/1/3/0/8/130873758/pawofutubotajeb-mazonobebazuli-lilenuterevor-xugalobepuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3887/files/bibemiroviwivurojowewoveb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/41033779685.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/79499134709.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/zavozowiniw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/vugunofikinaxixafosesodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/88171817217.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/xokalukamum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/baxijis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/55941846591.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/75718692331.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/kafukoxawotilikivu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c927.bin
15878ee2bc41bd56ce2fcc91836b766dfb65d6c5b8d9738807a92629395443be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 4904 bytes
font_01_sfnt_off0000d99f.bin
d619db0d0d0f22656218a37c8c2948f10a9764ef3531b808c98a73ddbd989b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 15604 bytes
font_02_sfnt_off00010a59.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16164 bytes

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