Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d96aa9bd5787e…

MALICIOUS

PDF

45.4 KB Created: 2020-07-18 05:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01aa0d460e1a32e982adc72b02c6c432 SHA-1: acd04a424bd240e4811a6782185e8f9f4c615374 SHA-256: 815d96aa9bd5787e0924e99beec395985d3270a1cc4896b2ccc6ba53fc6ae40c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body and heuristics suggest a link farm or SEO poisoning tactic, aiming to drive traffic to malicious sites. The ML classifier strongly indicates malicious intent.

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.cc/wb?keyword=betty%20crocker%20cookbook%2012th%20edition%20pdf
    • http://files.christandgod.com/uploads/1/3/1/6/131607063/2916586.pdf
    • http://files.tlsleadership.com/uploads/1/3/0/9/130969535/filor.pdf
    • http://files.govindaincense.com/uploads/1/3/1/3/131379117/fokalazepedibes_giposad_zorugejav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://takipeximon.files.wordpress.com/2020/07/zodazuteta.pdf
    • https://bilivogeji390496675.files.wordpress.com/2020/06/18661078910.pdf
    • https://sexepik.files.wordpress.com/2020/06/lenotezuva.pdf
    • https://pixapivuba.files.wordpress.com/2020/06/83431194398.pdf
    • https://sivagusinosi.files.wordpress.com/2020/07/81819134164.pdf
    • https://mijudabebog.files.wordpress.com/2020/07/favofepopufo.pdf
    • https://zorevuz.files.wordpress.com/2020/07/pogipa.pdf
    • https://jafujanile.files.wordpress.com/2020/06/67084572474.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/fulolilezepuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/41833174127.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/sonof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/vomibuzapekesok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/6621172322.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/16587251942.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/vugafuraweluboniti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/meruwesuwada.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/dusoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.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_off000074de.bin
a0feb6fa4a8daaa57a7ca93c4011b1cc489aafdec7c431def0600e817920a96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DE 5148 bytes
font_01_sfnt_off00008666.bin
2da11abcfb98834b47cffadf568c4b6d374442ac0e2131670823dfb34b0e8f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 9852 bytes

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