Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a565bbb634a91e…

MALICIOUS

PDF

65.8 KB Created: 2020-07-30 23:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cedc8d004889dbf227b3ae1e634b7289 SHA-1: cc6c5fa4c52b613dc1950c2048253b70aad20b9a SHA-256: b2a565bbb634a91e95f43491dc4ec51e37595c875eea2e3750b2971e973d4a1e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, characteristic of a link farm. One of these links directs to a known malicious redirector infrastructure, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=mapa+pais+vasco+frances+pdf
    • http://files.gofitmama.com/uploads/1/3/1/4/131453543/rivalodewikisavar.pdf
    • http://files.theirrigationrepairspecialist.com/uploads/1/3/2/6/132695596/2459411.pdf
    • http://files.quintemozartfestival.ca/uploads/1/3/1/3/131398143/6162566.pdf
    • http://files.jeffersonchoralsociety.org/uploads/1/3/1/4/131453715/davuxis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/sikini.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/40524033535.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/11056596717.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/boxemivimenekotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/wixelopazapofosiwugeruti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22511335110.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/4658024188.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/vupike.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/91584143219.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_off0000c5e6.bin
892f94ec868aa8adff6e2ec5cac08e83191342d79f48f888505a4e483595e1e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 4888 bytes
font_01_sfnt_off0000d68c.bin
89ca7dfdcc3eb8b106c964b537ada51c9f8a6e508863e617af12d06e75bffdd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 10388 bytes