Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81561951b7cee8f…

MALICIOUS

PDF

61.6 KB Created: 2020-08-31 04:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29486b8dd5ab1a94cb5ac128aea587b1 SHA-1: 4c2330c957146136014b0d04fe9e808f1a68f672 SHA-256: d81561951b7cee8f1dc13e241cca2430d36ffd6e5bc58f53dcecaec2b58e6fa0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to download content. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing attempt using a seemingly legitimate document to trick users into visiting a malicious URL.

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/wix?keyword=evolutionary+analysis+4th+edition+pdf+free+download
    • https://static.usrfiles.com/ugd/b8c837_407fb36b545b451db726156f0a55eebe.pdf
    • https://static.usrfiles.com/ugd/0f5b72_503b5431fc3147f5bb1e50b93e344afa.pdf
    • https://static.usrfiles.com/ugd/90423f_344b0277f1a441ed96b0486d9f149026.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1185/files/nisasipufuduwuzudogiva.pdf
    • https://cdn.shopify.com/s/files/1/0462/5081/9733/files/duplicate_excel_sheet_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0923/files/rubber_sheet_suppliers_in_saudi_arabia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/96276030345.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc892b3cb714e0c94ce61acef817458.pdf
    • https://static.usrfiles.com/ugd/3bf302_8fd06537b53642019ed4b90fe06fa776.pdf
    • https://static.usrfiles.com/ugd/b8c837_713cf3315c39486a8fafe1f340c7bd80.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/33614655278.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/milk_cake_recipe_video.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/apowersoft_screenshot_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f19.bin
63c9c76f63a9227cd1ee06e295f797da65ff375dc2d590967aeb17f9c65f8a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F19 5308 bytes
font_01_sfnt_off0000a13f.bin
eeb135994c74e095c385fcab4951f8ba298378c25b32dbaf652b278654a26722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13F 2112 bytes
font_02_sfnt_off0000aa6e.bin
c1f3ecece3f5a5f03bc482c4ba66333ad8eebde7314fe03df521e40e940a3899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA6E 16224 bytes
font_03_sfnt_off0000da77.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 4324 bytes

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