Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e18de86104e5d41…

MALICIOUS

PDF

62.1 KB Created: 2020-08-31 02:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87a5446311f74f3726834a07c214a3c SHA-1: bca46a7e25c544c40b2c22eeee32fc848fa2917a SHA-256: 8e18de86104e5d416f8b470cfe76ccdd26b9b5dab0440f1417572063bbc79fe8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=winged+nike+of+samothrace'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external PDF links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site.

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/wix?keyword=winged+nike+of+samothrace
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/58247170650.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/13052591222.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/pekezigisugodolavew.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/zodasajoraba.pdf
    • https://static.usrfiles.com/ugd/b8c837_98b8e68f9a124837b2e32dd7f6625552.pdf
    • https://static.usrfiles.com/ugd/269bb8_87041da56dc34cfd803368bc1807034f.pdf
    • https://static.usrfiles.com/ugd/a467d2_cad0675e45034b61b57406764aa3b4e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f9b1f3727c49e0a214c508011206bd.pdf
    • https://static.usrfiles.com/ugd/3aee12_c21714aaa99f42cca4b09889444fd850.pdf
    • https://static.usrfiles.com/ugd/b8c837_84925f555f054e87bcf7bacf60537fb1.pdf
    • https://static.usrfiles.com/ugd/f96b02_0f7a9eddc50c4aaaacde3bcebe5eaf79.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cf531dfbdce47a0aa3875a6378095fe.pdf
    • https://static.usrfiles.com/ugd/19103d_d4fe3a7714814850a8bc8b6e511d509a.pdf
    • https://static.usrfiles.com/ugd/ace02d_83cc466f092e4e52bad7084e02c32933.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b46d.bin
077ab756ca0d0b5fccf46416d22e38efa6cde8205877076b708f006419493e37
pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 5480 bytes
font_01_sfnt_off0000c6f9.bin
dcd1bd432c18a12851daf8b21a724c0730cbcc72b9932efde680a59b31752e22
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 11176 bytes