Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40449ba79448207…

MALICIOUS

PDF

51.5 KB Created: 2020-07-09 16:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb62b3d4ad77c8b6c7985eb07814a64 SHA-1: d240d229f4adcad6d9e45a638d8303e93400f445 SHA-256: d40449ba79448207ee624b80c0374699faf6845d81f7bb933775e6f13c2111c2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external PDF links suggests a link farm or SEO poisoning attack. The primary intent appears to be redirecting users to potentially harmful content.

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=scrivener%20tutorial%20mac%20pdf
    • http://files.fascinobespoke.com/uploads/1/3/1/8/131858975/maxabemurijuzisi.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.edwingreenbergphd.com/uploads/1/3/0/8/130874018/98919ad79.pdf
    • http://files.nanrubin.net/uploads/1/3/1/1/131164095/78144c98d018c.pdf
    • http://files.jmontanaphotography.com/uploads/1/3/1/8/131857580/rejol-zofejemosor.pdf
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdf
    • http://files.southdevonplayers.com/uploads/1/3/1/8/131871648/3602d20161be9.pdf
    • http://files.bigtrecreation.com/uploads/1/3/1/3/131379612/fasezojozixuf.pdf
    • http://files.bloominozzieclicks.com/uploads/1/3/1/6/131606280/4022744.pdf
    • https://xikijowo.files.wordpress.com/2020/07/29890378667.pdf
    • https://zaferogo.files.wordpress.com/2020/06/74483756127.pdf
    • https://majelatunuga.files.wordpress.com/2020/06/88139917219.pdf
    • https://wuxegura685470280.files.wordpress.com/2020/07/45222252159.pdf
    • https://rizuxagojagu.files.wordpress.com/2020/06/61761544103.pdf
    • https://mozujunovuj.files.wordpress.com/2020/06/96550634107.pdf
    • https://razekusokil.files.wordpress.com/2020/06/68763330398.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botolewapaniwid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaduvezumutup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.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_off000081cc.bin
80fc191fe789aee7353774eb69538fce0691d3228502852ca797173b8d173cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CC 5168 bytes
font_01_sfnt_off0000933b.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933B 1800 bytes
font_02_sfnt_off00009bc8.bin
c74d562c861867ba51465913db7239581096ceca1a8c95680c26a430e6cf24d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC8 11184 bytes

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