Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0fc1d303d90210…

MALICIOUS

PDF

62.7 KB Created: 2020-08-20 21:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd8ce878b3318cb456a48197816b408 SHA-1: 214caf3fd20f38b760fa6c931b563fb7e69b7364 SHA-256: fd0fc1d303d9021033932df8f272a18a7f214c1d1c7ac7d073f95948eb15b32e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=services+lab+activity+aphg+answers'. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=services+lab+activity+aphg+answers
    • http://movob.jtkimmusic.com/uploads/1/3/2/8/132814930/edf3f129e.pdf
    • http://files.glcleaningpros.com/uploads/1/3/0/7/130775354/e39a1b34bef5.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/action_box_v2_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1017/files/adding_and_subtracting_fractions_worksheets_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/23371743020.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/ragemujof.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/tuesday_with_morrie_summary.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7725/files/logical_reasoning_sample_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/4206/9918/files/75335680616.pdf
    • https://cdn.shopify.com/s/files/1/0455/3284/0101/files/natosetimomebufisujon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/pemelajirigivaxi.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_off0000af3f.bin
1ec05b1b8f5c4e4b8d2121297ee29f80d2e1a44b45e36816a29c6ab5878bac6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3F 5692 bytes
font_01_sfnt_off0000c2af.bin
3dcbd3597a91eaa6f21ff249b9528220989da5d6268318e7989d07cebacbdc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 14028 bytes

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