Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae49ce1e98d2b7b…

MALICIOUS

PDF

34.0 KB Created: 2020-08-22 13:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da006be862679c1cfec9a71205cbf9c SHA-1: b6cc7aa3566b3efc11575b952e01b227ac03f522 SHA-256: 6ae49ce1e98d2b7bf1959e7053fcc02078c90040a23814f8bb7eb345a6c024f3
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 point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=alphabet+tracing+worksheets+preschool', leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to potentially harmful content under the guise of educational material. No scripts were extracted, but the presence of numerous external links and the ML classification strongly suggest malicious intent.

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=alphabet+tracing+worksheets+preschool
    • http://nanejufak.brucedouglasreevesauthor.com/uploads/1/3/1/0/131070458/vejonezojinuk-vovobinadubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/tekobupasasotupenomesa.pdf
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/fedex_ground_bill_of_lading.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/67397133554.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/rugabeginuvogekumaju.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/above_all_names_planetshakers_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/palakimigisejewesojekom.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/ms_word_flyer_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/jazz_piano_music_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/xanozumopobevabe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004907.bin
a0dd2457aeacd1587e54bd675cddbb77be2edb574f8365c9b3f3920d91210be4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4907 5480 bytes
font_01_sfnt_off00005ba9.bin
372e384dd0f2ef76ae492025c758d0d34c20d19423d434f7757aa98c1ac62d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA9 9244 bytes