Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2eb55d6a38612…

MALICIOUS

PDF

39.5 KB Created: 2020-08-21 08:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c6a40e12066174b9d80ea2ed32662a SHA-1: 900f9e172937c9a99ce2b2b900f0a5786e7a2efa SHA-256: 90a2eb55d6a38612837b5ac0a235d3f3f3f21b99dd02af4aa2d4a470c465d560
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or social engineering attempt. The document body, though heavily obfuscated, contains text related to 'Marriott employee benefits pdf' and the malicious URL, suggesting a lure to trick the user into clicking the link. The ML classifier strongly flagged this PDF as malicious.

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=marriott+employee+benefits+pdf
    • http://files.daniellerose.com/uploads/1/3/0/8/130874276/wilafezedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3771/9717/files/livro_cedulas_do_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/65495540389.pdf
    • https://cdn.shopify.com/s/files/1/0437/3656/3866/files/bajirao_mastani_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5504/files/72143728411.pdf
    • https://cdn.shopify.com/s/files/1/0432/4576/4770/files/consonant_and_vowel_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/3119432411.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/sezuvigozetafifigalunid.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/technicolor_tg582n_firmware_infostrada.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/tefasilalakatikuxedoxadib.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_off00005a34.bin
58e869552ef873ec60e7a7aa24213661ebb89c324e6197f08b062da4861b14e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A34 5436 bytes
font_01_sfnt_off00006c9e.bin
3cda86b1ea8bf00ca6834fb3838f5da872fc3d9de1a1f95c72808a0124880cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9E 10784 bytes

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