Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd3e0d175e77473…

MALICIOUS

PDF

59.9 KB Created: 2020-07-12 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4de37135ba0dc0e5828339bc644dc55 SHA-1: cfcf53683e2ac46d1eb1411c581df7bdf30ee182 SHA-256: 4dd3e0d175e77473410683e681f65787665e14232ef6b757ab49fa4b62cc3f10
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be largely obfuscated or contains minimal readable text, but the presence of the link farm and the malicious redirector strongly suggests an attempt to drive traffic to harmful sites.

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/pify?keyword=noble+drew+ali+the+exhuming+of+a+nat
    • http://files.avtreasurehunters.com/uploads/1/3/1/6/131636941/kowulamizevo.pdf
    • http://files.scharencycles.com/uploads/1/3/0/7/130776118/ginukaxezunat.pdf
    • http://files.murderhollow.com/uploads/1/3/0/7/130739120/a155bc8863eaa.pdf
    • http://files.avtreasurehunters.com/uploads/1/3/1/6/131636941/ko
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/goxiwudatafabomem.pdf
    • https://bijutinibi.files.wordpress.com/2020/07/jumemazeluvemukeso.pdf
    • https://ranojogirufe.files.wordpress.com/2020/06/mususizamerogoramo.pdf
    • https://lavisegiz.files.wordpress.com/2020/06/5622388034.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/tojoraguvelikure.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/86082889695.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/49953819361.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/8785445082.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65496272691.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_off0000ae2b.bin
d74810e6c05c4a9a7d2e0ea83b13da0f5eb94a9486d91f2e2c52a7161f634f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2B 5296 bytes
font_01_sfnt_off0000c01e.bin
db181da69d06996f045f44d2cc915728a322ee11457e4e8d6c86140c58ce596b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 10076 bytes

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