Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6a07b4de548dc9…

MALICIOUS

PDF

47.3 KB Created: 2020-08-10 16:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9401159a8933a06849070f5c064c38 SHA-1: 7c4ea12557bc32fd996ccb7ba54422ae65385aea SHA-256: 9b6a07b4de548dc93123371b8b2c5f8cf597fb22bf83dd4937a583b7f3fa79cb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=modified+barthel+index+of+activities+of+daily+living+pdf'. Additionally, it features a PDF link farm heuristic, indicating an attempt to distribute multiple links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs hosted on Shopify, likely as part of the link farm.

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=modified+barthel+index+of+activities+of+daily+living+pdf
    • http://files.mccullochsfitness.com/uploads/1/3/0/7/130775286/letijufuxir-rovevuruz.pdf
    • http://files.christianmemoirs.com/uploads/1/3/1/3/131379820/zudawigumiro-ludejubesi.pdf
    • http://files.thechangeagentswebsite.com/uploads/1/3/0/8/130815009/guxawafetuweroxaned.pdf
    • http://files.artmatterscommunitystudiogallery.com/uploads/1/3/1/1/131164152/vewafuj_jerepuf_giletadobul_tejop.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/15489696383.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/82840349773.pdf
    • https://cdn.shopify.com/s/files/1/0436/4586/2041/files/gta_5_xbox_one_dns_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/3611/4076/files/smokey_and_the_bandit_3_cast.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/60076112788.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/bipoxizowojeduxanugoxepiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/neoplasia_endocrina_multiple_1_y_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/ginavalobuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/66151395479.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/edital_da_prf_em.pdf
    • https://cdn.shopify.com/s/files/1/0440/1990/8758/files/adobe_indesign_complete_tutorial.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_off00007802.bin
debd2d021a7139535873e918c419e39297a50211e02ad471b7f0d3eaa43ab5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7802 5792 bytes
font_01_sfnt_off00008bc7.bin
c94c9f18509aa7a3a9b61d9f5033a289b7889e5d6d41dd3aa12fd40f9bdaa454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 10592 bytes

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