Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bd8f60b1671888…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 17:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e21540896001e0b0773436df972e4de1 SHA-1: 7bd48900c7e6d6eeb17256f9b2ee2cf838665cdf SHA-256: 81bd8f60b16718889b63a64f961271a1477e9dffe607ebf46d89f3933b126c45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate practice PDFs but redirect to potentially malicious infrastructure like ttraff.com. This technique is commonly used to distribute malware or phish for credentials. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=properties%20of%20parallel%20lines%20practice%20pdf
    • http://files.alexvietti.com/uploads/1/3/1/3/131384552/zakugekobe.pdf
    • http://muloziji.haveyoueverserved.com/uploads/1/3/2/7/132740405/barubumejexejof_vadakegef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0311/6709/files/95011168273.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/69717907624.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/rekulusazoni.pdf
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/nazetadamovawumuseguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/mikagipot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/49908074797.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/6959386071.pdf
    • https://cdn.shopify.com/s/files/1/0431/5473/5264/files/islamic_calendar_2020_usa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/how_to_install_act.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8405/files/kukexumejifawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0312/files/luvivukagexebuxusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/wonediwino.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/wezelalu.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d82.bin
e0baa1fd6c7f91ed5ec24f5fa41f351f5054fe0f03eeeb9918fdc530c9d3e2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D82 5152 bytes
font_01_sfnt_off00005f0b.bin
a82cafd21100a9aef5a076cba678819573ffc10f5b9096b0c04e527274a22b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 10136 bytes
font_02_sfnt_off000081c7.bin
8d64339dc9961633bdfa63864cda8f522c7fd744259f4fd1b6783eb703aa00e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 16116 bytes

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