Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0885adcb4979f6…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 10:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a4a2d52d5be84c35359fe66ee9dbd4 SHA-1: 55fa4a627afc57fb8ca825418ee32d341671b59c SHA-256: cf0885adcb4979f6de2b5665a00522ef2b9e91692a8e91617b82a1aac3bb566e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an Android Google account sync error. This redirector likely leads to a malicious payload. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting a broad distribution attempt. The ML classifier 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.cc/pify?keyword=android+google+account+sync+error
    • http://files.caninetrainingacademy.net/uploads/1/3/2/6/132682142/gosoxobirolan-xegaziguwoz.pdf
    • http://files.mcgilltennis.com/uploads/1/3/2/3/132303269/wovilazedazivexovu.pdf
    • http://files.michaelwinograd.net/uploads/1/3/1/4/131437378/semurefurinogoku.pdf
    • http://files.meady.com/uploads/1/3/2/6/132695465/2089613.pdf
    • http://files.yodopay.com/uploads/1/3/0/9/130969206/tisifunavaduz-buzetijijovo-gixubojuve-renukume.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/drill_sergeant_modules_army_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/30830407444.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/capitals_of_countries_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/newesipodetujuzelogige.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/tifaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/12973613156.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/movie_tv_apps_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/kizulonipumutisomaruvaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/risozapevuzedudareni.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/70818424248.pdf
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/1st_amendment_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0445/4517/9807/files/cambio_climatico_consecuencias.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_off00006654.bin
88cdbcbe9ae41997f3120509e2ef8b0cc93f29c0f2a01fd7740205f8ee0dccf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 5200 bytes
font_01_sfnt_off0000780d.bin
5ad7900e53a4445b5654715abd6b643ac1edf1a555631e5c9e1daf0a4f00742b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 10024 bytes

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