Malicious PDF — malware analysis report

Static analysis result for SHA-256 da575dc061e22a9b…

MALICIOUS

PDF

71.1 KB Created: 2020-08-16 19:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31b1c853c6b47b03b2cb865ac16bb54 SHA-1: 440b54ddcffd3338e6532922f83bb89e63490c84 SHA-256: da575dc061e22a9b73e964e30426fa34962737837d4e43898dc70f2c0fae56c0
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with the primary one being a redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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=bootstrap+simple+admin+template+free+2018
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://wobanunuf.northpointacademy.net/uploads/1/3/0/7/130739059/412858.pdf
    • http://files.mymountaindrive.com/uploads/1/3/1/6/131636807/d9f69fb032e6.pdf
    • http://files.jaldridgephoto.com/uploads/1/3/1/4/131453054/d8ca04aab2145.pdf
    • http://files.aymestreyschool.com/uploads/1/3/2/3/132302870/jimoxezoraj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/google_sheets_line_break_in_cell.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/51346306263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bapumonotirugapagemuzigin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8882/8829/files/virtual_villagers_new_believers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/bearing_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/tuzuril.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/majevugimuzirezudid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/aqua_barbie_remix_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/bumolawarifi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/cachaza_de_caa_de_azucar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/leatherworking_leveling_guide_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/finding_limits_using_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/butilobobivikozuguju.pdf
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/75003336312.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_off0000d97b.bin
22369783bc277f1dd6c548fa0e0ebf7f18826894e0ced12252bcfbfd4e350123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 5756 bytes
font_01_sfnt_off0000ecfd.bin
3df6493fed1571e466221e863e2e2be49f55cf7ba014d0f144774ae3f1006590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 9916 bytes

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