Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedd25a6387e2483…

MALICIOUS

PDF

42.9 KB Created: 2020-08-01 02:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356b2a090afe817bcfc8386fd796bb2d SHA-1: fb7b19b8f4d542e997f734070f6ed2567a378fc9 SHA-256: bedd25a6387e2483d86be1bd4306223336c3f7033266a0bfe5f0218b2955814d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of the URL 'https://ttraff.cc/pify?keyword=npm+not+found' in the document body further supports the malicious intent.

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=npm+not+found
    • http://files.wharfemporium.co.uk/uploads/1/3/0/7/130739369/317b3fbeece8.pdf
    • http://files.deeperwaterscounseling.org/uploads/1/3/2/3/132302940/9486648.pdf
    • http://files.rebaspizza.com/uploads/1/3/2/6/132696214/bujidesugi_kivawovusak_jabalixosusi_nisujonanadi.pdf
    • http://files.pepelapoule.com/uploads/1/3/0/7/130739522/jutevutinuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/federexuve.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/wuwuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/45256276836.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/wowovutesimukubupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/gumona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/nusibolim.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/51527463517.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/69544857839.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_off000065e1.bin
ef963aeae91cd18b764a3aa714ed2318f0e2257d39f9571a86ed086e280dbdde
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 4640 bytes
font_01_sfnt_off000075ab.bin
11dc2a38e4d9bcf355f809261963b71833f2a5119ed0a8dffaa77888d6e0bf3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 12820 bytes