Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ac60954d7515f8…

MALICIOUS

PDF

46.4 KB Created: 2020-08-05 06:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 383b12e6d4005941ebb7b5c8380ae416 SHA-1: cc72d9f7fe71e8161ea3e5996c57f1ea4ad58f8f SHA-256: a6ac60954d7515f82bb4f6bf7ab8879928be09554be52882258b0a61463fda34
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate PDF downloads, but the primary link redirects to malicious infrastructure at 'ttraff.ru'. This indicates a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

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=old+man+and+the+sea+pdf+download
    • http://tapamom.readysetnonstopnature.org/uploads/1/3/1/4/131437812/1017191.pdf
    • http://baxesa.seattosleep.co.uk/uploads/1/3/1/4/131453247/bizolage-pakufu-zesasuleru.pdf
    • http://davukuka.caffeinatedlearning.com/uploads/1/3/1/4/131411896/9573597.pdf
    • http://files.bordersnaturalburials.co.uk/uploads/1/3/1/8/131872104/godafazofof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/numawolulirejiwuvor.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/bolatateduwepube.pdf
    • https://cdn.shopify.com/s/files/1/0437/5383/2609/files/practice_it_answers_bjp4_self-_check.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/86698850932.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/8422568179.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/best_epub_reader_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/gowefuwer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/arteritis_de_takayasu_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/56352213288.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1277/files/rexopero.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/xoxetumazizijizugot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/rapebovututazabisinozod.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/belipador.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_off0000623f.bin
638e24796709fb13ccd963a9d8efa96f044869cb325a38550e78d339298dca9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 5304 bytes
font_01_sfnt_off00007430.bin
bf75ef2b0cdcedc25da78f18aba8bd58fd647f7620964b964400a9c7e85de5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 10188 bytes
font_02_sfnt_off00009715.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9715 16092 bytes

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