Malicious PDF — malware analysis report

Static analysis result for SHA-256 01612656820fb0ca…

MALICIOUS

PDF

45.8 KB Created: 2020-08-01 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2978cbf4361ddde94215529ebf92e9 SHA-1: 10518d917ad6daf9329d7eb8520294eba6d47df5 SHA-256: 01612656820fb0caf9bef9b9e938d5d77d2d416426172ca24e545f59912ffe4c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one heuristic specifically identifying it as a 'PDF SEO Link Farm' and another flagging a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO spam or redirecting users to potentially harmful sites.

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=javascript%2524%2528%2527.+overlay%2527%2529.+slice%2528+0%252C+100%2529.+click%2528%2529
    • http://files.six-tech-usa.com/uploads/1/3/0/9/130970003/zudavuronabejo_timobakopazu_zoxademevazaw_fozod.pdf
    • http://files.gladstoneluthiers.com/uploads/1/3/2/8/132814898/delezuzevo_nirilokozeleruv_terenozifamoji_dekufowe.pdf
    • http://files.superiorwomenexpedition.com/uploads/1/3/1/4/131453982/jinujeka_sivegi_dugijuzuvegone_lobow.pdf
    • http://files.mipostcards.com/uploads/1/3/1/3/131381480/mokozufunesip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/51861230444.pdf
    • https://cdn.shopify.com/s/files/1/0432/8698/6908/files/69984045160.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/19958206397.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/10672563551.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/32503268201.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/ravariwosuxajeguxademoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/48572198090.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/perl_warning_setting_locale_failed.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/34595968724.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/wawepowutizagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/merekudefofonujiwofit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/dugizixujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/23483920261.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_off00006456.bin
6312c3d24f9402d3173930d1980e4dc6378a5193554b8141829fa07bfb6e5e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 5848 bytes
font_01_sfnt_off00007893.bin
f5ecbcb7d2723831bb8ad8d536bb9fdf4dfe1b4ea4defcd1203fd358cdcbbfdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7893 15908 bytes

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