Malicious PDF — malware analysis report

Static analysis result for SHA-256 0449a640d90f20ba…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 06:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b5a945dea334b90c0d3ed1ac7d1ed4d SHA-1: 67837a93876d3a535b49d6f5ff93d361c23b44f7 SHA-256: 0449a640d90f20ba436ff9dc51a0e51dc605dcd526be1a1645af2737a584aaa0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a primary malicious redirector URL, disguised with a plausible-sounding title. The ML classifier strongly indicates maliciousness. The embedded URL is used to redirect the user to a malicious site, likely for further exploitation or phishing.

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=java+swing+interview+questions+and+answers+pdf+download
    • http://files.tierradelcielofarm.com/uploads/1/3/1/6/131637679/zemodesonasoz-tiworovu-mibipiwefobuli-xifeguroke.pdf
    • http://tidijaf.larienca.net/uploads/1/3/1/4/131453536/2dc13cd5358c58.pdf
    • http://bojafer.foothillmiddlecollege.org/uploads/1/3/0/9/130969060/1068611.pdf
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/david_deangelo_books.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/56244704673.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/install_ubuntu_alongside_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/caregiver_burnout_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/bitegagenuvosaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0844/files/memelifaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/ccie_collaboration_quick_reference_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/nuvofiwebuputirewodatabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/soxetujogomisurol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/movetexumemovadugade.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2278/files/52779336113.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/vonijafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/lurabigexosamo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081f6.bin
ed65d3eaf1ac1bc4556898d2e537b114866db3989e0dc7da62d416f4d4320b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 5476 bytes
font_01_sfnt_off000094b2.bin
3e088de55a22e541dbe364d2eebda0ec7e140d7d755d8aa8980b90c5097bccc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B2 10048 bytes

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