Malicious PDF — malware analysis report

Static analysis result for SHA-256 986aab412dc90b98…

MALICIOUS

PDF

51.1 KB Created: 2020-07-22 04:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e01236c436c6352ae562de011f26850 SHA-1: a0914494369594b7b5d9455fa64ad5c8e303fc75 SHA-256: 986aab412dc90b987ba906c4eebb66a751d2213626de75d4c7bcaacc91a44d80
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The primary malicious URL identified is ttraff.ru, which is used to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Aircraft interior design pdf'. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=aircraft+interior+design+pdf
    • http://files.brockdvickers.com/uploads/1/3/1/0/131070572/467430.pdf
    • http://files.fatdaddyssports.com/uploads/1/3/1/3/131378953/siteforo_pugilukipijelev_nifurinoxudav.pdf
    • http://files.quielclass.com/uploads/1/3/2/6/132695200/4beb92fbe218210.pdf
    • http://files.quielclass.com/uploads/1/3/2/6/132695200/4beb92fbe218210.p
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/fabaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/guvedewozusujase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/69039859372.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/vusoxamedipunesep.pdf
    • https://cdn.shopify.com/s/files/1/0429/9689/1807/files/porivozi.pdf
    • https://zotevewu.files.wordpress.com/2020/06/48403222202.pdf
    • https://sawamadet.files.wordpress.com/2020/07/xeludiporumegurakuz.pdf
    • https://tikewivi.files.wordpress.com/2020/06/73966702622.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49816413057.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/tafakitozege.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/vumazejujodonolukijogatol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/suvanimux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/80497053422.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/87303493387.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_off00007cce.bin
bccbc1f4cc634d6111534458148356cdcbd5a81b82e76ade945c904fe87735be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCE 5068 bytes
font_01_sfnt_off00008e04.bin
d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E04 6068 bytes
font_02_sfnt_off00009db4.bin
323c5b8ca6b886ca04e3403700661e730ff1b5dba3fb02cfb3b3b292f4f5d4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB4 9716 bytes

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