Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b9a607ad63e02e…

MALICIOUS

PDF

52.9 KB Created: 2020-08-08 06:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07cfa9084bcd94c35a72f63edc1627b2 SHA-1: 7b3db4296b301a95bb5c130bda79164da9bf37e3 SHA-256: d3b9a607ad63e02e746a0b0c5827ce74e16274607903b1a0575cf8a2c3aea43b
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary redirector URL is https://ttraff.com/pify?keyword=musica+andina+peruana+pdf. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for users searching for specific PDF content. The ML classifier strongly supports the malicious nature of this document.

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=musica+andina+peruana+pdf
    • http://files.heritagefairsns.ca/uploads/1/3/1/8/131857419/ef6ebcf7d5d55ae.pdf
    • http://files.melisandepage.com/uploads/1/3/0/9/130969974/8974473.pdf
    • http://jiposi.melisseairesbooks.com/uploads/1/3/0/8/130874633/6731518.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/4/131405977/8140955.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8307/files/cardiology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/24300558923.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/94555686445.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/96869898010.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/90024584334.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/catalogo_truper_2020_precio_distribuidor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/tezevemenonozivinu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/6582051520.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/22247417137.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/zekawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/hernia_hiatal_cirugia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/mrityunjay_kadambari_in_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3010/2694/files/door_closer_installation_guide.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_off00008eb9.bin
39fd82e52be69d8644cf0e66e95f8095dedf498d9dbf47ab76e1e809a318d433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB9 5120 bytes
font_01_sfnt_off0000a041.bin
db33788b64f89783acfc42cef6085bea82377697608204f32b0f4a7fe21bd910		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA041 11420 bytes

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