Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28d9a8aa41963e…

MALICIOUS

PDF

33.7 KB Created: 2020-08-30 00:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ec53a796ce5991f7a4beebca6d39e8 SHA-1: 85db3251beb43b1b16877d0faa8f005bd6168490 SHA-256: 0a28d9a8aa41963edd3c59bf064bb50d43543b3b333b7c1c6afdf41af1809e14
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 a link farm designed to host numerous PDF documents. One of these links, 'https://ttraff.cc/wix?keyword=essentials+of+comparative+politics+5th+edition+ebook', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a social engineering attempt to trick users into clicking the malicious redirector.

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/wix?keyword=essentials+of+comparative+politics+5th+edition+ebook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/10e3af_e73bde3790e54606983e40ddd666b1d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e68aa1eb549b4fbbb7bac419402132c2.pdf
    • https://static.usrfiles.com/ugd/16a96a_1ea5d2667e0d47f287ae46fbea230b74.pdf
    • https://static.usrfiles.com/ugd/b8c837_29761a4f13a847ff9d8959fd0521ee1f.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/8710190386.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/haryana_bjp_candidate_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/81856949493.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/negidazuwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/advanced_accounting_beams_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/42406142467.pdf
    • https://cdn.shopify.com/s/files/1/0457/3613/2764/files/bhai_marathi_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/xolanudubu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/tokawogijisexibomiwidesed.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/wuvitiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/minecraft_item_generator_1._14.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_off0000458d.bin
0439ae5281a1a003962c8b998bfec3cb89e1820be18c233e8220a8ac71f16f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x458D 5740 bytes
font_01_sfnt_off000058f1.bin
d0c0e810498849cfd1a7cab8e8472506926244a76486d48a34c460e5f0467263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F1 9572 bytes

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