Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3859cbd8deb3ae…

MALICIOUS

PDF

57.3 KB Created: 2020-08-18 13:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ca90d7020812fc99367ec4372e8dd8 SHA-1: 0cb317aa0d941e46c8e8d33f3bb191d12325ff09 SHA-256: cd3859cbd8deb3aef490bab07424acaa109d59857b2255281c24a4839bb3b032
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many of which are SEO-optimized and point to PDF files hosted on various domains, including a known malicious redirector. The primary lure appears to be 'IELTS listening test samples', directing users to `https://ttraff.ru/pify?keyword=ielts+listening+test+samples`. This suggests a phishing or scam campaign leveraging SEO techniques to distribute malicious links. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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=ielts+listening+test+samples
    • http://files.oatag.org/uploads/1/3/0/7/130775607/gififejavuwuza.pdf
    • http://files.ablepestinc.com/uploads/1/3/0/9/130969705/1637905.pdf
    • http://sezebebaf.rockingb5.ca/uploads/1/3/1/0/131070993/wakamazepesom-jobezomapemener-farerezapumuzi-nusaxe.pdf
    • http://files.soniabarneydesign.com/uploads/1/3/0/7/130775665/zoduzuwofumogilere.pdf
    • http://files.gsfchristianacademy.org/uploads/1/3/1/4/131409090/bilego-batijemosoresi-kajefux.pdf
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/81421444729.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/nugawujomipena.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/23942245264.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/39445844077.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/cyber_bullying_articles_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/xuwumulebiwifivowule.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/61828303724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/kufog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/vokamixaxobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/16951975923.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_off00009311.bin
1f0eb32cc356c3b8378e7bb295f0a741b8e426f532d36c4a9ac95630c064be94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9311 4656 bytes
font_01_sfnt_off0000a2bb.bin
483a3023648064c20f55d392e244c7ee9ebaa733f715a61da54a6298a6da0c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BB 12404 bytes
font_02_sfnt_off0000ca8f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 4324 bytes

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