Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff51ff8754d4440…

MALICIOUS

PDF

44.2 KB Created: 2020-08-22 11:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5624bf25ecf8cf7ad3319b0c1df0bb SHA-1: 5ac430bbc0efa936f075e361ba34c3ef0926afa9 SHA-256: dff51ff8754d44401ca4ede290d7f02a93321af51e696201f8c534a03e88762f
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a lure to malicious infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL and several other links, suggesting the intent is to drive traffic to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=reported+speech+statements+exercises+intermediate
    • http://files.cardinaldesigns.shop/uploads/1/3/1/3/131379181/nisaguxavinib_renepazuw.pdf
    • http://files.emcoburlington.com/uploads/1/3/1/8/131856757/1bcba8e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/cubby_house_plans.pdf
    • https://cdn.shopify.com/s/files/1/0441/2227/5992/files/php_upload_file.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/15468555920.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/service_manual_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/irs_form_4952.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/dopelibanezaveritataxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/56676215088.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/vefonewarunebugebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/free_printable_vehicle_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/77816686165.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/marketing_strategy_definition_by_authors.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_off000051e1.bin
94edec49aef1925776383fdfcd3e5d455040e7367cd5af6dd9a165e89b86aea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x51E1 5356 bytes
font_01_sfnt_off000063f8.bin
0be235532807d2baa578c8e073a243c13b2f9b3c3384d951ec4d027859819067
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F8 13808 bytes
font_02_sfnt_off00008ed6.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED6 16096 bytes