Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5d4e4f6813af54…

MALICIOUS

PDF

44.8 KB Created: 2020-08-11 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23ffdb8c7061d2417591119f5508dd1 SHA-1: 77daaaecb7ffe8e1221337ada660d80271d6b132 SHA-256: 7a5d4e4f6813af546d676d645351f2faa0e2b23af0d2262c807b3390d1ccce07
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=centrifugal+pump+startup+checklist+pdf. This indicates the document is designed to lure users to malicious sites, likely for further exploitation or phishing.

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/pify?keyword=centrifugal+pump+startup+checklist+pdf
    • http://files.beckywrightsongs.com/uploads/1/3/1/4/131453486/449c67f1.pdf
    • http://files.sweetchairendipity.com/uploads/1/3/1/3/131398253/kixifolewe-denud.pdf
    • http://zuzeni.nologoproductions.com/uploads/1/3/1/6/131636725/8742474.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/3328595351.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/xawepidozupekokowubikagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/45386625992.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/pixitized.pdf
    • https://cdn.shopify.com/s/files/1/0443/2812/4572/files/blasius_theorem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/voxudibubuvebafapapur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/78151765030.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9251/files/puxikow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/labodiratesutefuwuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/wixufuwada.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/pebepobevokewejavivaniti.pdf
    • https://cdn.shopify.com/s/files/1/0432/3871/9648/files/mixodilanab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
e1497a94bb8e4513af4e4b9f9da245b621a16cec49228b8d216c90179b1ae28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5428 bytes
font_01_sfnt_off000076a2.bin
ac13dc64d1027b9434af18fc2bd7943737aee4ef4c8a51937a5c6feb3a22911a
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 9768 bytes
font_02_sfnt_off00009807.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9807 4324 bytes