Malicious PDF — malware analysis report

Static analysis result for SHA-256 986974404a38d370…

MALICIOUS

PDF

43.1 KB Created: 2020-08-24 08:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eadbc147aa908d68c0172e4ef37115d3 SHA-1: 82de93feebbb95411254b9ce7eb4fb21a71c6490 SHA-256: 986974404a38d370e4c0f9d929fa70c85c8bc84126f183d05d0eaacdc63051d8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The primary malicious URL is 'https://ttraff.com/pify?keyword=le+cercle+de+la+forme+lecourbe', which is likely intended to lure the user to a malicious site. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient 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.com/pify?keyword=le+cercle+de+la+forme+lecourbe
    • http://tufamuze.justkeepreiding.com/uploads/1/3/1/0/131069934/9535158.pdf
    • http://files.drmarysabal.com/uploads/1/3/1/3/131380558/1104339.pdf
    • http://lefaposot.cdabible.org/uploads/1/3/2/6/132681411/c17377d28.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/savep.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7599/files/nazovunonilamojaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/13270732898.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/shoulder_bursitis_exercises_kaiser.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/grievance_procedure_template_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/52435998086.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/nsfas_application_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/new_sepsis_guidelines_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/96352441630.pdf
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/online_to_dwg_converter.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/29279448952.pdf
    • https://cdn.shopify.com/s/files/1/0439/7514/7678/files/wivimonasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/fibimefasojaniruzopaneg.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_off000065fc.bin
216066df104f632d36f7f6acb720af08e754aca6e40a752e3930e2c90efc8bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 5072 bytes
font_01_sfnt_off00007721.bin
777c63964d26e27bf2b8088a11f7a989a13812b0fb4df64e9faf9727e0822695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 12264 bytes

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