Malicious PDF — malware analysis report

Static analysis result for SHA-256 b999499ec7fc0024…

MALICIOUS

PDF

45.8 KB Created: 2020-08-30 23:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd3146ecddeb73cca59399e9e32c5ef SHA-1: 90075edf83eabdcbf11d362665a67369992b4ebe SHA-256: b999499ec7fc002462755f3f0ca21ba4d225ec34a08ee8c7af3c6bf65ba367af
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, including a suspicious redirector and several Shopify-hosted PDFs.

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=al%2525C3%2525BCminyum+d%2525C3%2525B6k%2525C3%2525BCm+hatalar%2525C4%2525B1
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/calculator_apk_lock.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/satel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/haskell_binary_tree.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/anandi_vastu_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/plaut_aulularia.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0725/files/afterlife_hailee_steinfeld_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2ba7c7dd6148fb955195fcd3266268.pdf
    • https://static.usrfiles.com/ugd/e3ff21_431cfc9258c84bf194cd632ab9959c7e.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_off00007394.bin
9a2b3cbb215ecd12b10b811a975ab082eb644b12d7d28f90f464556bff4b3ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 5332 bytes
font_01_sfnt_off0000850e.bin
d1d5bd1eca13201da87893fd80784a35f1cc4fa7f19c579df094120b246e6489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850E 10724 bytes

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