Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bb8a8b2bc93dc2…

MALICIOUS

PDF

46.9 KB Created: 2020-09-18 01:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e52bcd1f0aac7504623ce0ba228091dc SHA-1: 9a5592a80f751aa6ba6dbab55327e4e63a0a6ab4 SHA-256: 63bb8a8b2bc93dc213f34cfd00b45c87926a404f1c08d369288c0ab6be90fb62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the extracted malicious links, suggesting a lure for users to download further malicious content. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=houdini+manual+update
    • http://files.minursespac.com/uploads/1/3/1/3/131383456/4c672f259.pdf
    • http://zitoj.paulhorsman-author.com/uploads/1/3/1/8/131856706/depumanijo.pdf
    • http://guxid.ecoaa.ca/uploads/1/3/0/8/130874179/sanewugetigo-gijuluwu-nidazuxa.pdf
    • http://veded.misterszymanski.com/uploads/1/3/2/7/132712461/ef9a3062f4ae18.pdf
    • http://tedidosem.jumpforjoymemphis.com/uploads/1/3/1/3/131378950/1874730.pdf
    • http://dodupivi.alitheajosaphine.com/uploads/1/3/1/4/131437753/witapebawo-ratifewimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5cfb701a-aad1-4894-98d0-6d05ac9d0b66.filesusr.com/ugd/17159d_e0fc7f9ebf15455682f3b9756a00cf42.pdf?index=true
    • https://9a22a33c-054c-421c-8827-93976a9e1e0f.filesusr.com/ugd/0bfb20_b6f1a6419739417698effd182cb6d500.pdf?index=true
    • https://61646372-dc26-4b13-9c3f-8b864a9c1ee8.filesusr.com/ugd/455f95_4a2278bde0f04f94822e525da8e09a3f.pdf?index=true
    • https://68a41faa-9171-4156-9586-de9cb6c6d929.filesusr.com/ugd/f1780b_d25ddeb32f7e4c52b1faf6074e5bc0c1.pdf?index=true
    • https://b457b9a7-4976-4059-8cff-04073937b33a.filesusr.com/ugd/1cc7e8_8f6e178e7738417ea4c9c614d1e9e03e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/ptk_biologi_sma_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/staying_fat_for_sarah_byrnes_by_chris_crutcher.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_off00006db0.bin
fc8e15f0fb6bf744e40ba567317dcf615f501b5e19b2167bb10c47ad358e7be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB0 4676 bytes
font_01_sfnt_off00007d6d.bin
b4cf46493c842cdf64fa9a6a6a2619dc533b79b899227004d3658eb443aa4b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6D 10456 bytes
font_02_sfnt_off0000a13c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13C 4324 bytes

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