Malicious PDF — malware analysis report

Static analysis result for SHA-256 c999cd40e3940f9a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 05:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22039c94c2bfa34a3b1000d0552d5fd8 SHA-1: a2c9a5ede2f5fec4aa2db8c406a67a19a3f1a5d4 SHA-256: c999cd40e3940f9acbd74b2799293196c1cba375d994becb997d87ae9da9ff01
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified as https://ttraff.cc/pify?keyword=autocad+2020+pdf+text+box. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=autocad+2020+pdf+text+box
    • http://files.fireflyfamilydaycare.com/uploads/1/3/1/4/131452800/safaraziko.pdf
    • http://files.marrakeshguidedtours.com/uploads/1/3/0/8/130813834/dd9dfe0f.pdf
    • http://files.englishbynia.com/uploads/1/3/1/3/131383760/8180081.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/15109201207.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/67899263573.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/ettercap_kali_linux_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/vodujikugiremu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/megupexosekijasexewag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/rixuvovoxamazinevipemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/50463366800.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/zosiwekebulexixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0318/files/assessment_for_learning_examples.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/gikutaleve.pdf
    • https://cdn.shopify.com/s/files/1/0438/6983/1323/files/boule_de_suif_francais.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/586624293.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/balance_druid_leveling_talents.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/
    • https://cdn.shopify.com/s/files/1/0433/9286/0318/files/assessment_

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006538.bin
fcaddb7cd8ebb6e3dbbf6ad075ab829df462f5117989e2719c6cef4e9df72908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 5312 bytes
font_01_sfnt_off00007764.bin
bfa287088ab67585f69065266f1afcf1149506ec533483e948457574330d303a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7764 9732 bytes

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