Malicious PDF — malware analysis report

Static analysis result for SHA-256 186007428d2deb82…

MALICIOUS

PDF

42.7 KB Created: 2020-07-23 21:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da700822ef2b07ceb049d41263a36eff SHA-1: a85bf4d027d27380e17f75bb7122a823e9460cbd SHA-256: 186007428d2deb825733a1ba20d77eebaf3733a1c49a7233747ea3132c34b918
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a technique often used in SEO link farms to artificially boost search engine rankings or distribute malicious content. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. 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.com/wb?keyword=pdf%20merge%20utility%20java
    • http://files.sanjoseexpress.org/uploads/1/3/1/3/131398046/7719881.pdf
    • http://files.meghanfoleyyoga.com/uploads/1/3/1/6/131637409/nowax.pdf
    • http://files.teraflare.net/uploads/1/3/2/7/132740172/nanezuxetirurob.pdf
    • http://files.thedymabase.com/uploads/1/3/1/8/131856456/5391518.pdf
    • http://files.safna.com/uploads/1/3/1/4/131437953/3081309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/zuwedavulesifenuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sekokejeninidifowabofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/vojejijosukalutatupufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/1023343112.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/fenewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/33155836503.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/50354596927.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/76770949859.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/ragex.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/58485460514.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/dimamuxobibumokukoloxito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.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_off0000692b.bin
38420356a044f0417f521d2659458b3015a17ac637a4e350446f06f81ebcdddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692B 4952 bytes
font_01_sfnt_off00007a0a.bin
a78195079f92d63335094f94f93ad0bc4e5a8dc959170a68fb4eb3dcc18c9c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 10516 bytes

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