Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b4586d811d627e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-02 19:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8a79200abda581abe9f9cb4230e3a5 SHA-1: e4eec41a15974ba56245064bdc1cc8ef87e7c574 SHA-256: d5b4586d811d627e89106a26b263f123ca0f3b6e3fe8d3a71d7c514f7543fe72
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, with a critical heuristic firing indicating a link farm and a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=skip+and+shannon+podcast, which is likely the primary malicious destination.

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=skip+and+shannon+podcast
    • http://files.bikingtheforks.com/uploads/1/3/1/4/131407742/93ed40e1.pdf
    • http://files.tbirdnutritional.com/uploads/1/3/2/3/132303170/6990544.pdf
    • http://files.heymannportfolio.com/uploads/1/3/1/4/131437531/2152611.pdf
    • https://cdn.shopify.com/s/files/1/0434/0380/4839/files/gajixamibusibupelilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/39610080798.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/57195146754.pdf
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/duwojav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53741046047.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/gigopozebifevezifomux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/neluwib.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/20306626293.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/mosoworepuziz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/pukititewubog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/nord_vpn_accounts.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_off00005584.bin
22883bedf16bac0fe675839c8585b44a0b6414a5e1b9a4cd28f7209c7c008e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 5200 bytes
font_01_sfnt_off00006738.bin
86d31bd271e5ad7e28848aea4ac7aab031c6a133a1e7fd5c1b114f7afa2a35f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6738 10180 bytes
font_02_sfnt_off00008a3f.bin
bbc8a377ea308525ea4a093a1cfbcbef18081e68dbc1dc7ef94177a4c93541e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3F 16448 bytes