Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f718b71c130640…

MALICIOUS

PDF

46.8 KB Created: 2020-08-25 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aca88f6f142d67b4936b49987c5ffdb SHA-1: 7420d01e1b76d1333c295f4f023af1fc3d4c0d62 SHA-256: 68f718b71c130640ca6892c6899f04f062a00f78b6a2d6b9e840c47280747cf4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate academic resources but ultimately redirect to a known malicious URL (ttraff.cc). The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute traffic to malicious sites. No scripts were extracted, but the embedded links are the primary attack vector.

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=finding+inverse+functions+worksheet+algebra+2
    • http://gidilaw.houstoncremm.com/uploads/1/3/0/8/130873982/e2e435f7e1f71be.pdf
    • http://vatinixuj.neilpresleycox.com/uploads/1/3/1/3/131383377/1102626.pdf
    • http://files.bayoujews.org/uploads/1/3/2/6/132681937/xosetorab.pdf
    • http://files.simplyhooked.co/uploads/1/3/1/3/131380467/6deb2d7b4af1eed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/acrylic_sheet_design_for_mandir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9272/files/542447497.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/louisiana_real_estate_commission_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/76162711935.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/adeleke_university_school_fees.pdf
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/61967785640.pdf
    • https://cdn.shopify.com/s/files/1/0439/3399/1080/files/rajukuduxujuzuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/small_aircraft_wing_structure_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/wowagiwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/biophysics_demystified.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/2003_road_king.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/puxefosapijisegadoru.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_off00006122.bin
47d3c764654c8fcf6035fcc9788094db98a2ffbc11c583d81e89753563d921d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 5608 bytes
font_01_sfnt_off00007443.bin
6fa1db13d589f303768321b79d4e6abcb753c5e179b2fa364fa60949152ed091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7443 13712 bytes
font_02_sfnt_off0000a024.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA024 4324 bytes

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