Malicious PDF — malware analysis report

Static analysis result for SHA-256 5397559e8637caa2…

MALICIOUS

PDF

41.7 KB Created: 2020-08-11 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2387a27d166d32a619b6bb20ff789a84 SHA-1: 6a18c76e6114c7cf1d87d1945fb2adadc2535813 SHA-256: 5397559e8637caa20d1f1f6e9f087cc60468986004327caab96a84518d6db8b5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used for SEO poisoning to lure victims with search terms like 'panduan budidaya ikan lele pdf'. The document body, though heavily obfuscated, contains this URL and references to other PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the redirector link finding.

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/wb?keyword=panduan%20budidaya%20ikan%20lele%20pdf
    • http://mizovas.sweetworldtravels.com/uploads/1/3/0/7/130738870/7936223.pdf
    • http://files.sacredheartlibrary.com/uploads/1/3/2/8/132815753/tawazevedekuxow.pdf
    • http://files.geoffbrunell.com/uploads/1/3/1/3/131398091/afa3bae8e.pdf
    • http://files.dragonflypaddleyoga.com/uploads/1/3/1/3/131383775/vimoligunonutuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/3158886333.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/21673953907.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/3076371183.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/jalakimisojokobozujat.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/pzo1135_horror_adventures.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/87295972579.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/dujokajozar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/91617898823.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/1317186040.pdf
    • https://cdn.shopify.com/s/files/1/0434/8959/1461/files/dadimumesikitetelujuv.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c8.bin
a04dcf2e57e1c73e5c9a6d348027aa5f3047c133446c60fb7663714b15791d7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 5068 bytes
font_01_sfnt_off0000771a.bin
bfa2bbbd0fb77a1864302b2b6621f246b85ab6e7c3c66114d01dccfa2d74866c
pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 10204 bytes