Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f82f1201cb3a4b…

MALICIOUS

PDF

39.5 KB Created: 2020-07-30 16:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023395f21746007fad75e6d8dab1fe3f SHA-1: b3ba940ef7a0aaf5a5a718c94bdef4224990e296 SHA-256: 74f82f1201cb3a4b48dd2758dbfcc38638f75505f994db52fe949b0d169cd07c
154 Risk Score

Malware Insights

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

The PDF file is identified as malicious due to its redirection to known malicious infrastructure and its function as a link farm. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent, likely to direct users to harmful sites.

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=cambridge+igcse+geography+revision+guide+pdf
    • http://files.stpeterslittlebray.com/uploads/1/3/1/8/131856109/zabopeka.pdf
    • http://files.southlyoneastdrama.com/uploads/1/3/2/6/132695195/5688362df1ec4b9.pdf
    • http://files.hotchocolatedispensers.com/uploads/1/3/1/4/131437981/defifedetuketiwiza.pdf
    • http://files.gwenlafleur.com/uploads/1/3/0/8/130874678/2521013.pdf
    • http://files.fpcmorganton.org/uploads/1/3/2/7/132741375/xugojazijuravuvozewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/saserezuxetix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/40254992405.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39646295774.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/82077611643.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/6639022456.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/75761602004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/29286829679.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/nosemawipavevaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/wesuvametoju.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/nokarozaxotosawukolosofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/29567259861.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/82301526364.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005968.bin
0f738e808f2a9293869464557df3964f8b789f2c673241b6bd9080a622df2bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5968 5664 bytes
font_01_sfnt_off00006c8e.bin
27ffc06e3c2b12750af7ad2ed8738f09831fe5284db0fcf7e4e0a1d932fd19b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 10264 bytes

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