Malicious PDF — malware analysis report

Static analysis result for SHA-256 4390cef074078580…

MALICIOUS

PDF

59.6 KB Created: 2020-08-02 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef66d4b7e658f63ab0dd2741d11d4386 SHA-1: a3b6958ce75a1d0d4a9e947cba173bdaac35e489 SHA-256: 4390cef074078580eb4ddcc0a491a37aa90f6b39afca306e0d4ecfe9a98291a9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for Minecraft-related content. The primary attack vector is likely a user clicking on the malicious link within the PDF, leading to a redirector that ultimately serves malicious content.

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=minecraft+sphax+texture+pack
    • http://files.alinacruzfengshui.com/uploads/1/3/2/6/132681213/7537608.pdf
    • http://files.kineticorllc.com/uploads/1/3/1/8/131856860/jorapakofi.pdf
    • http://files.photorevel.com/uploads/1/3/0/7/130738779/jekutagexav.pdf
    • http://files.thesoundingboardministry.com/uploads/1/3/2/7/132740536/1229490.pdf
    • http://files.theroombrighouse.co.uk/uploads/1/3/0/9/130969879/xamot.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/zasusovadifigadubejejabim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/19215235991.pdf
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/81189512382.pdf
    • https://cdn.shopify.com/s/files/1/0439/4034/8059/files/36835370168.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/buzulotifoninu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/15116468631.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/56133465413.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/xonadotupasum.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/string_to_integer_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/xazuxozerunotoges.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/22324793020.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_off00009dcc.bin
7b06c5611e781f10cd9e8586b3817b677bfc4e9b1159fcc6522780969010133b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCC 4980 bytes
font_01_sfnt_off0000aeb6.bin
ec448e7a75ef4254faa12da45ee1d6f17512c0719bc51e003f93d62d92cf7cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 10668 bytes
font_02_sfnt_off0000d323.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 4324 bytes

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