Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa5a85c361d61d…

MALICIOUS

PDF

50.2 KB Created: 2020-08-21 05:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5cceb99572ec37fde01df83cb36634d SHA-1: fd0e74143d6ea9cb6a6954e26395c4a99b4dcccb SHA-256: f6fa5a85c361d61dee60371ef3a69e3eb0574da729a32d139c194bd1cc7eae89
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged as a malicious redirector. This suggests the PDF is designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=coliform+bacteria+in+food+pdf
    • http://ponema.moonrabbitquilting.com/uploads/1/3/1/3/131379732/kapiliwibodimij.pdf
    • http://files.designs-by-nathan.com/uploads/1/3/1/3/131380158/9ba8b0a.pdf
    • http://files.naturesintent.co/uploads/1/3/0/7/130776828/3014528.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/zeitschrift_fr_assyriologie_und_vorderasiatische_archologie.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0462/1454/5561/files/blue_butterfly_wallpaper_app.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/23533303548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/inverse_of_2x2_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/14914402835.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/29318321699.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/54592943694.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/moving_house_card_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/0268/3545/files/esc_guidelines_hypertension_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/21099397340.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/musomobex.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/luzubewamuzedebike.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_off00007154.bin
a560ddd9ca03967ad04f7c90d4dcef510676d956a0f26c9d426002a36cc934b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7154 5168 bytes
font_01_sfnt_off000082c4.bin
ca5f962e243ffa39928602bfcb8b372c359f77ce3a3fe40c18d88294d6b6682c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C4 10188 bytes
font_02_sfnt_off0000a5d9.bin
f77972c353b33f73bb6c165739ca4c01067b7b527bd9d028a27aa4245e14d088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D9 16208 bytes

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