Malicious PDF — malware analysis report

Static analysis result for SHA-256 7293832b1c33556c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-10 13:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8782d3fd5a7b6efbb86833217e638d22 SHA-1: 71f805ca774b12ffe24f79e2b5f272ff011765eb SHA-256: 7293832b1c33556c7f2db0e585667603534853beb3c9d662e679dffd50d924e5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. This suggests the PDF is designed to lure users to malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly indicate malicious intent.

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/pify?keyword=dahua+product+catalog+pdf
    • http://lugemavol.brackettvilleha.com/uploads/1/3/2/3/132302780/5ca24a0.pdf
    • http://joniwem.palmislandestates.org/uploads/1/3/0/9/130969060/runidimixu_temewere_kisitumaxara_lozapapikusiwu.pdf
    • http://files.carlyberg.com/uploads/1/3/1/4/131407459/giwob.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://files.mitsiadislab.net/uploads/1/3/1/4/131438308/1e18189a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/59300437328.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/55739797030.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/27033023070.pdf
    • https://cdn.shopify.com/s/files/1/0434/4699/3052/files/94902099248.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/number_theory_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4487/1063/files/27721987560.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/dagafelofi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/functional_programming_in_c_enrico_buonanno_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/lenupidawuwaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.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_off00004d6a.bin
245af0ccf3822adf261769891e143c7bd77fd501d14e9f64f47d243ab9b453e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6A 5236 bytes
font_01_sfnt_off00005f39.bin
c234bc21c5b1a445fb09b6c31775f8a5ca95a1f93a316e8fc3eeb9500012006c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 10104 bytes
font_02_sfnt_off00008208.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8208 16164 bytes

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