Malicious PDF — malware analysis report

Static analysis result for SHA-256 7915aff805ebdd87…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 07:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0989823ef1129c7298382d150eee70c SHA-1: 84da7e0e17c3f4da1ce8ca372884fdbd88511f01 SHA-256: 7915aff805ebdd874cc875a6e0cabd77d29c53e2c503103ba6289da0c7d0e3bc
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 pointing to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent URL, 'https://ttraff.com/pify?keyword=mixed+punctuation+worksheets+grade+6', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating an attempt to drive traffic to malicious infrastructure under the guise of educational content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=mixed+punctuation+worksheets+grade+6
    • http://files.mallorywinkler.com/uploads/1/3/1/3/131380467/4351960.pdf
    • http://files.vielka.com/uploads/1/3/0/7/130776327/dolezoxitukugas_furiwonufu.pdf
    • http://files.yourgiftgarden.com/uploads/1/3/1/4/131483149/xajub-tezowebekamaguw-zatepokoverunez.pdf
    • http://duzena.cuasp.org/uploads/1/3/1/6/131606490/6810122.pdf
    • http://files.eltapancorusticfurniture.com/uploads/1/3/0/7/130739449/3b2eb1f3e846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/54978452053.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/maths_olympiad_books_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/527383692.pdf
    • https://cdn.shopify.com/s/files/1/0447/2127/5033/files/create417_barcode_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0447/3038/4537/files/michael_jackson_type_song_onlineaudio-_converter._com.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/fenima.pdf
    • https://cdn.shopify.com/s/files/1/0439/1229/8648/files/94097525100.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/nurezokub.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/63300778598.pdf
    • https://cdn.shopify.com/s/files/1/0461/9275/4841/files/rejobijo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/suxebebisuxekilag.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_off000066a0.bin
3207c6188af04f366ed22aaab0493245791be799a33a041bc80348e19c968028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 5688 bytes
font_01_sfnt_off00007a14.bin
3dd1d2bb2db6ba61edaa39ca89b7cd27462ecb90e1fd2bb84e480a119e3b6151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 9952 bytes

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