Malicious PDF — malware analysis report

Static analysis result for SHA-256 e714ddefd44c1ec4…

MALICIOUS

PDF

52.7 KB Created: 2020-08-20 04:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7baf7dda92580a1cb6fa49242af69ac SHA-1: 91295046a762dca491fca58cb3543ce2dea5b5b1 SHA-256: e714ddefd44c1ec40715b0c089034456421976a5537a2be47fb1d4e5455d398c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains a critical redirector link to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to PDF files on domains like 'cdn.shopify.com' and other less reputable hosts. The document body itself contains garbled text and a URL that appears to be part of the link farm. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via a large number of embedded links.

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=administra%25C3%25A7%25C3%25A3o+cientifica+e+teoria+classica+pdf
    • http://wizogejuf.berkhamstedbees.com/uploads/1/3/0/9/130968931/pasigajolose.pdf
    • http://sifijaku.nuggets.space/uploads/1/3/1/6/131606255/gemaxaw.pdf
    • http://wopaxidus.radburn.org/uploads/1/3/0/7/130739415/muwavow.pdf
    • http://files.minxylydia.com/uploads/1/3/0/9/130969659/tefizabokebet.pdf
    • http://xatepenuv.gatewayheights.org/uploads/1/3/1/6/131606122/biwuzosisuluxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/legal_services_authority_act.pdf
    • https://cdn.shopify.com/s/files/1/0445/3364/5476/files/mga_halimbawa_ng_adyenda.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/22664727626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6343/files/wixegoxodejidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/lepik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0462/7827/9317/files/weather_report_satellite_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/34809665382.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/ultimate_mortal_kombat_trilogy_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/denulamibuzegox.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/18206351252.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/jasupem.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_off00008af9.bin
c6a3a615710c68b95f9259b656eb02720d8f75614f6755c9a0ce4d65df4ad6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF9 5788 bytes
font_01_sfnt_off00009dad.bin
f8f842f9e2d1792a784f7b920bf9f3363a0f6d1ffb8a9aa456c62dfc1c76fb0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAD 12372 bytes

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