Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae70113ef5a89fb2…

MALICIOUS

PDF

43.4 KB Created: 2020-08-20 21:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a380589df0472157545c8a55ae7e140 SHA-1: 403a238b38fa0d44f7d43244ffd19d9894185c2b SHA-256: ae70113ef5a89fb2bf6fad29250cadba672085684efb0b3e41162cdc9d779f42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to ttraff.com, which is known for malicious activity. The document body, though heavily obfuscated, contains the text 'Attestation de formation word gratuit' and the malicious URL, suggesting a lure for users to click on the link. 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.com/pify?keyword=attestation+de+formation+word+gratuit
    • http://files.brahmansystems.com/uploads/1/3/2/7/132712207/51933.pdf
    • http://files.jewelzandbling.com/uploads/1/3/2/6/132696598/8576686.pdf
    • http://fanifuk.ricepaperdesigns.com/uploads/1/3/1/4/131438137/sewizuxonanu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/xusebopume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xamunodobesezuwenetubaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/fmea_aiag_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/ruxewizajenesam.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/75820527855.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/careless_whisper_audio_song.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/how_to_cope_with_stress_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9017/files/rurapijutebatasalikebot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/canon_eos_60d_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/simple_rental_agreement_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b54.bin
16c079874f12ed8c6687fe5b957456fed7e2ddc0debf4dd4fa3ac0f29c64bc87
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B54 5156 bytes
font_01_sfnt_off00006cd1.bin
6be4bed71469362f34007dce1028fcd87443ef51c48ee0b4be245144acf28008
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 11396 bytes
font_02_sfnt_off00009120.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9120 4324 bytes