Malicious PDF — malware analysis report

Static analysis result for SHA-256 a055c40094b2f486…

MALICIOUS

PDF

53.7 KB Created: 2020-07-16 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dddad41ac9a2613efe766b1b84775a10 SHA-1: 6573a8c48b8482234d07752714812768d65379c7 SHA-256: a055c40094b2f486de629fc6990a4d86f2d08905b8ff0b3f1216e56d9831cdf8
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.cc'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is sufficient evidence for a high confidence assessment.

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/wb?keyword=electrons%20in%20atoms%20worksheet%20pdf
    • http://files.keepanopenmind.net/uploads/1/3/0/8/130814642/354913.pdf
    • http://files.meganwinsormusic.com/uploads/1/3/1/3/131380158/4249cc.pdf
    • http://files.greendentalpractice.co.uk/uploads/1/3/2/3/132302928/a49a9b.pdf
    • http://files.conversazioniconilventre.com/uploads/1/3/2/7/132740412/d7430d4c.pdf
    • http://files.jahafrica.com/uploads/1/3/1/3/131378837/kutejetoku_danufoji_lirifufogov_fomixanatin.pdf
    • http://files.stvincentchallenge.org/uploads/1/3/0/7/130775391/wovazodaped.pdf
    • http://files.scottmassagetherapy.com/uploads/1/3/0/8/130874333/nuwigilur.pdf
    • http://files.lindaboving.com/uploads/1/3/1/4/131406453/1484224.pdf
    • http://files.flawlessskinstudio.com/uploads/1/3/1/1/131164002/4000228.pdf
    • http://files.thirddropcoffee.com/uploads/1/3/1/3/131398447/danupomokon_konolazogele_jomifoza.pdf
    • http://files.jahafrica.com/uploads/1/3/1/3/131378837/kutejetoku_danufoji_
    • https://vuvobifo.files.wordpress.com/2020/06/2937559256.pdf
    • https://wadilejux.files.wordpress.com/2020/07/vilovopiluzo.pdf
    • https://famunuguraj492377956.files.wordpress.com/2020/06/44022908094.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/23381303728.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/11497548933.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/90558056617.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/badolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/30323083479.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/xuwakenumexuzixaxoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/54397431273.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_off00009454.bin
e8a09aab8bd9103452c54b413669039cde62fcfadcc162b9e4f333dcccf5f38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9454 5296 bytes
font_01_sfnt_off0000a632.bin
b0adb0a516c67213acd393ceeb1ae632d2664991c6156727efdec886bcc5afef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA632 10288 bytes

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