Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec676493367296f8…

MALICIOUS

PDF

86.9 KB Created: 2020-08-06 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4ec711d29f9b8db44479d8f1e49bc8 SHA-1: e870af7e37e0f081b13552ac89891f0c80c270c1 SHA-256: ec676493367296f8fa2436a9c9e8ad93e495426cb3e30ad69c6a7bcee15e4605
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting a lure to a malicious site. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or to distribute 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.cc/pify?keyword=morphology+of+foraminifera+pdf
    • http://files.carolinachildrenstheatre.com/uploads/1/3/0/8/130873921/busekub-jesutuloka-tubis-sijejiz.pdf
    • http://files.kevinanglade.com/uploads/1/3/1/8/131856844/7c1eba2fa301.pdf
    • http://files.psykotherapist.com/uploads/1/3/2/6/132696465/ropetebux-gevibejomit-tuwules.pdf
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/23053950542.pdf
    • https://cdn.shopify.com/s/files/1/0429/3980/9959/files/epidemiology_of_type_2_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/sort_dictionary_by_value_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/simple_bio_data_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/lajulutiginu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1254/files/mebigovoduvako.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/37982897950.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/16099001274.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/pathfinder_roleplaying_game_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/zukakorepologari.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_off00010b0f.bin
a3cb0600a1fbcb54b6b7ab567022d47c2f6c8735da26daa72246a7098c6b2018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 5384 bytes
font_01_sfnt_off00011d45.bin
7775e8e7c4329a1c5bd112c001158d8940360085fc48f9208aadc231de0e3d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 1716 bytes
font_02_sfnt_off000125ec.bin
1a49b2efb55b77df895daec3862eecc7d71c9d38959a1567cf0de221dc747e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 11256 bytes

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