Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bcc958803415bc…

MALICIOUS

PDF

57.8 KB Created: 2020-08-03 12:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2cab300b7a5a445475265a312bc9d1 SHA-1: a74ef7d2bb273fe7ca8a4fc2b6e07511c9dc1f68 SHA-256: 61bcc958803415bc6adff3c4a5733a9b70082b2df1cf6520b691419045c22449
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. This suggests a link farm or redirection tactic designed to lead users to harmful content.

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.ru/pify?keyword=entrepreneurship+development+pdf+notes
    • http://files.writeonyouth.com/uploads/1/3/1/0/131069789/003ddb.pdf
    • http://files.thebeachhutcambersands.co.uk/uploads/1/3/1/8/131871484/nelusepupumasi.pdf
    • http://files.longevitymonth.org/uploads/1/3/1/4/131406861/fovonazo_zumusiboju_letivamupokaz.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/94349461113.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/85292730141.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/pebonutidufor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/26762647696.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/wovox.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/vemozinazipume.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/60093720847.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/56439029909.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/nadupirujuzipumulode.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/85014591726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ginowojero.pdf
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/32080560287.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/rexozetuwexamerolekir.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d44.bin
8377dbf2cc4e8c76a3773cb399dc8df2fc37b019d1041623a1c00b3a6685ba3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D44 1604 bytes
font_01_sfnt_off0000a56c.bin
32639f60626f615cbdc899ad1b796d4356106b818849835db9e9e4a7e5854175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA56C 5088 bytes
font_02_sfnt_off0000b69d.bin
028fd9e6f9d00423d69d7db320a31251f1e79a399454748f3b3d9b4a30c79194		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 10292 bytes

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