Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bf7142f1add2e3…

MALICIOUS

PDF

37.9 KB Created: 2020-08-09 00:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193647264d4ada78fe5d5e9e5bd0ea25 SHA-1: 2671e929d515fe34b4e84acc4a7db65245aec632 SHA-256: 52bf7142f1add2e3c736a10fc9c5fd9d13de22b491d2f6109d0977457f4202d7
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link redirecting to malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=caucasian+chalk+circle+free+pdf+download, which is flagged as a known malicious redirector. This suggests the document is designed to lure users into clicking the link, likely leading to a further malicious download or phishing attempt.

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=caucasian+chalk+circle+free+pdf+download
    • http://bubelof.campbellanderson.com/uploads/1/3/2/3/132303382/1568584.pdf
    • http://files.ccmresource.com/uploads/1/3/1/3/131398140/17e4c6fc1ab.pdf
    • http://files.geekandgamercounseling.com/uploads/1/3/2/6/132695351/14b7b8acbe5c36.pdf
    • http://files.lamsdorf.com/uploads/1/3/2/7/132710721/2002312.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/49105569694.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/47904946131.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/mimafekexubav.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/wokemukofewotazukarukevon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5912/files/ray_bradbury_all_summer_in_a_day.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/jujosunabiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/90721437785.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/ios_10_activation_lock_bypass.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/vigeganaxizateluvavugezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/jevujagaruxususexenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/55310814836.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/zedixedumitisolubuxisanoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/how_to_install_fallout_new_vegas_mods.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_off00005577.bin
d367dfb394b2a8539824995a2719239fa353b8c1b9ea26f5b077593828abbbf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5577 5304 bytes
font_01_sfnt_off00006789.bin
47519cb92b4a9b1a0312baf4f4c9db3ff3b484ba888495f57323f17992752e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 10388 bytes

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