Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8c6fc4b5cd6739…

MALICIOUS

PDF

54.4 KB Created: 2020-07-19 06:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e822f8de7e1af28062ccf8a1ba883169 SHA-1: b6bfae96def38aa3286bdaff6e4b9c38b1b55438 SHA-256: cd8c6fc4b5cd6739bae01bc97d51a8070a6fddfa38a9b2d20f219aea8747cb81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'birthing from within pdf free' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential SEO poisoning or phishing lure. The presence of numerous external PDF links further supports the SEO poisoning hypothesis.

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.com/wb?keyword=birthing%20from%20within%20pdf%20free
    • http://files.wakeforestfarmersmarket.com/uploads/1/3/1/4/131411600/1787495.pdf
    • http://files.childrenssunflowerhouse.com/uploads/1/3/0/7/130775751/bupek-suwunexadiro-joraf.pdf
    • http://files.ololhednesford.org/uploads/1/3/0/8/130814868/golepajifibinud_fexonamevuwiw_nugidanadud.pdf
    • http://files.thegreatlife.com.au/uploads/1/3/1/3/131384101/68f1aed75c9c.pdf
    • http://files.childrenssunflowerhouse.com/uploads/1/3/0/7/130775751/bupek-suwunexadiro-joraf.p
    • https://gigeseberi.files.wordpress.com/2020/06/6359881806.pdf
    • https://miwexelak.files.wordpress.com/2020/07/87602274793.pdf
    • https://somotug.files.wordpress.com/2020/06/wuzag.pdf
    • https://nezatupivet.files.wordpress.com/2020/07/18510738975.pdf
    • https://piboberedaz.files.wordpress.com/2020/06/50672480177.pdf
    • https://dopiximodo.files.wordpress.com/2020/07/94043226224.pdf
    • https://felaweve.files.wordpress.com/2020/06/48450662087.pdf
    • https://kibazuson.files.wordpress.com/2020/07/52069483901.pdf
    • https://gamekupori.files.wordpress.com/2020/06/sefirafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/14485598511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/luvinafiwuduxozipadumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/89159814129.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0433/6258/2693/files/45018987535.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/ripuberaxefixaw.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_off00009841.bin
e5e45337ea8a6d59e9445df04db1ea01a8978e9a3df8abed64f5adfc570fc8fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9841 4964 bytes
font_01_sfnt_off0000a90a.bin
de7b5c80f71d18f6a563f0ed4defe3462b472c44b0c8cb3e153ddf6020703b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA90A 10336 bytes

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