Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a799e13cb6fdb49…

MALICIOUS

PDF

72.2 KB Created: 2020-08-09 09:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e934fc1bc940f31d744dcb9fee67fa58 SHA-1: 138be94e95c549cc3c56ddc4167b0b8905f3e0af SHA-256: 3a799e13cb6fdb498796919148c244eba6e9b86d9c1080497da48b5f9c0866c0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector: https://ttraff.cc/pify?keyword=adobe+reader+9+password+protecting+a+pdf+file. The document body also contains text related to Adobe Reader, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links indicates a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

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=adobe+reader+9+password+protecting+a+pdf+file
    • http://files.capecodcanalchamber.org/uploads/1/3/2/7/132741352/1523401.pdf
    • http://files.ottawaeumc.org/uploads/1/3/2/6/132695525/xevonetifeti.pdf
    • http://files.erinumc.com/uploads/1/3/1/3/131398366/xofipipefezore_mufofemuxi_xemaperax_jilivaguzola.pdf
    • http://files.littlepicassobaltimore.com/uploads/1/3/2/7/132740525/3666971.pdf
    • https://cdn.shopify.com/s/files/1/0451/3880/4889/files/gewazemoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/tasutikorunozidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/safuginogatujato.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/pneumatic_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/2993/8855/files/firuziruza.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/stanford_chemical_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1025/files/scalp_acupuncture.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/bopaxomafijaxurefa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/36713656924.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/movevajalepanix.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_off0000c52d.bin
faad9a71119057dcc32b09676e6102cfe0d93c71284a2187ddbd38b8ea0530c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 5700 bytes
font_01_sfnt_off0000d8b5.bin
f7521f1963344cd57d8b932667693a7b59af1c7789883fc329dd9c80f9bb0226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 11076 bytes
font_02_sfnt_off0000fe55.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 16148 bytes

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