Malicious PDF — malware analysis report

Static analysis result for SHA-256 b861cd678ca52e1d…

MALICIOUS

PDF

52.6 KB Created: 2020-08-05 23:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15ecfeb45d52736e3bc92e79e07948b SHA-1: ed25e10a8eb1addf6372b6e915f22865079cd996 SHA-256: b861cd678ca52e1db679db5fb674ce7d48165850e6f1eb299881993f6d1e18a4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to a redirector service (ttraff.cc) known for malicious activity. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or phishing campaign designed to lead users to malicious sites.

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=ascii+and+ebcdic+code+pdf
    • http://files.shoalhavenhighschoollibrary.com/uploads/1/3/0/7/130776230/fabajagi.pdf
    • http://files.auburnrotarybbq.org/uploads/1/3/2/6/132682892/vizikoketunatutiz.pdf
    • http://files.magicbrushpottery.com/uploads/1/3/0/8/130874324/feroxaxitatimi-bavodaxuda-zigego-jotenijekeb.pdf
    • http://sazikela.welshploughing.com/uploads/1/3/2/7/132712207/1497308.pdf
    • http://files.shopverjus.com/uploads/1/3/0/7/130774979/1606711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/walden_thoreau_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6880/0676/files/RTMP_A._RTMP._YOUTUBE._COM_LIVE2.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/lepivuzusalumorux.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0466/files/59903303238.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/windows6._1-_kb4012215-_x64._msu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/29952951338.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0502/files/74576625617.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/71763370036.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/51275664050.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/90753174356.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/wilezuxazuredepimibategif.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/41140220065.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/jobajipopazex.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_off00007c64.bin
148c6b8e096e7e6c6a20ae9498a902e336be83661371d6008cd0fee35f9043c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C64 5148 bytes
font_01_sfnt_off00008dfd.bin
c1d5b8de230263ec436c091c0c6cf7d90a44c7f6dfb1920a7d8c92aca3fd112f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFD 17348 bytes

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