Malicious PDF — malware analysis report

Static analysis result for SHA-256 35da4541b42a7972…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 04:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1efe452a27346e1139111fe8ca5cb4f5 SHA-1: a79815cca6fd34197a00732af3528389553f29b5 SHA-256: 35da4541b42a7972e469be33fc8b1b6b8f9ae44ecf4d908162b7b2e66d87b276
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'legal aptitude test questions and answers pdf'. This link, 'https://ttraff.cc/pify?keyword=legal+aptitude+test+questions+and+answers+pdf', is a critical finding. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious, supporting the attack pattern of luring users to malicious sites.

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=legal+aptitude+test+questions+and+answers+pdf
    • http://files.hycartstudio.com/uploads/1/3/0/8/130813796/nunufugedujob.pdf
    • http://files.leaddeadwoodartscenter.com/uploads/1/3/1/3/131380687/aa0743246.pdf
    • http://julovowu.restorationcommunitychurchbc.org/uploads/1/3/2/3/132303382/tizexek.pdf
    • https://cdn.shopify.com/s/files/1/0448/5994/9218/files/blackroll_duoball_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/croos_zero_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/burodufavimekadezaweripus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/wisitepezeredakoru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/de_clerambault_automatismo_mental.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/cash_book_and_bank_reconciliation_statement.pdf
    • https://cdn.shopify.com/s/files/1/0448/4002/6273/files/pirates_caribbean_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/sri_atmananda_krishna_menon.pdf
    • https://cdn.shopify.com/s/files/1/0448/0139/2801/files/reasoning_alphanumeric_series.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/oral_antidiabetic_agents.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/bengali_astrology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.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_off000062a4.bin
08ebcf8e3114e9df89806efc7ff07e67902cdbf554ee0df55f01531701af5c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 5368 bytes
font_01_sfnt_off00007504.bin
476d45f17dbca667137113db047232ca8a19e559ac9ae41d598f6ed1fd919d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 9948 bytes

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