Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b4c8c40a28fd67…

MALICIOUS

PDF

56.3 KB Created: 2020-08-11 20:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4abd259418d8ecfe3203bdfe628d0813 SHA-1: bb1866a4483b38f8fbfcf8b97726abcb129d2ff9 SHA-256: 19b4c8c40a28fd67f586f5814ff07de88fdef92ba3c2708e12f87cdc410c1b11
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness.

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/pify?keyword=arabic+letters+with+english+pronunciation+pdf
    • http://files.artguildofclifton.org/uploads/1/3/0/9/130969966/0724f.pdf
    • http://files.brookbelden.com/uploads/1/3/1/1/131164402/d90db892.pdf
    • http://dugolot.dragonflypediatricot.com/uploads/1/3/0/8/130874422/3990547.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/no_intro_sims_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/calculus_late_transcendentals_multivariable.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/nosepexaxabowudif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/wifikorotazamiwowudubuvo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/daxaxajom.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/28489754394.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/megoxidojixugapilanaseg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/border_song_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/zokojibinarulogakujejif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/complete_champion_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/85722818189.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/62643527374.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a84d.bin
b4c4bb4aaf7aea303421d1f4aca0743f007cf07c93daa52c246be2dbe9550a08		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA84D 26096 bytes
font_00_sfnt_off0000716f.bin
6f63419dee5da53712ebc365e7c1c3b58ff41e7ffa321386759b6726dd27dadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 5640 bytes
font_01_sfnt_off00008497.bin
06e9d6c4a8420ddabf079550a20fb3cb73532bf73e04df70d4990bc5d903fa1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8497 10844 bytes

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