Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b4d290d0812a21…

MALICIOUS

PDF

65.5 KB Created: 2020-08-05 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3341fc180937c6547864f55dfa82348a SHA-1: fddbd8279e59c4517de20f1cb85f98e79238a388 SHA-256: 78b4d290d0812a21d66d15016f32259544763abdfc687f1922efe3e021b847be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One prominent URL, 'https://ttraff.com/pify?keyword=analytical+maths+questions+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links indicates an attempt to drive traffic or distribute further malicious content. The document body, though heavily obfuscated, contains the same malicious URL.

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=analytical+maths+questions+pdf
    • http://files.thegaydybunchfamily.com/uploads/1/3/1/3/131383483/xinepunubob.pdf
    • http://files.sumiko.us/uploads/1/3/1/4/131407635/sosepekuz_xatujujuvoxu_nizenowuziratar.pdf
    • http://bofodazem.lizorrell.com/uploads/1/3/1/6/131637881/dabf6ee2.pdf
    • http://jukufitus.jessmarais.com/uploads/1/3/0/7/130776483/1759106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/volakimupudanidozuxuxata.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/22956356404.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/16287337289.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/gokapolimavigow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/lepibusegeduzaxupew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/duwikogiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/gasepojubenitubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/niwijaxadagogewidanix.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/sikiger.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/28788884402.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/53715370181.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/73097361053.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_off0000b4d7.bin
e504f8397fc9c877987f16c0cc5d055a7bde46d7e7c5d86dcc489b8c98a1c39a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 5400 bytes
font_01_sfnt_off0000c70b.bin
b1ed082ffc40d7a9fb72bad3c99f641eeaa0d5051b8f911f43cacc11f3b1f9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10532 bytes
font_02_sfnt_off0000eab2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 4324 bytes

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