Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e4f69d0c1c1439…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 05:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0457572225595e30a0b5a4e9bb097fe SHA-1: 9ee0de94a31ed48151edf4f6d53ef2f61bd1bc07 SHA-256: 21e4f69d0c1c1439cb38aa1db127ff9f720905b08a51d3b96d6678d134a1caad
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=mr+akhilesh+kumar+ringtone`. The document body, though heavily obfuscated, contains this same URL, suggesting the intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=mr+akhilesh+kumar+ringtone
    • http://files.busarovasart.com/uploads/1/3/1/3/131380547/ninipuref.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/13654959794.pdf
    • https://cdn.shopify.com/s/files/1/0436/7866/2809/files/definition_and_classification_of_carbohydrates.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/naxujutitesoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/adhyarathri_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/20102596851.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/90253033525.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7317/files/88005099645.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1382/files/jenenixarumajezemona.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/shura_no_toki.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5900/files/sean_combs_net_worth_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/parestesia_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/7285/4939/files/website_monitoring_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/xodamowitaxafeboguvomumik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/43984297917.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_off0000559f.bin
37fe93b2822a19912c9a8b3d198fa4ffb150637eba271421416e54c378a3a95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5168 bytes
font_01_sfnt_off0000670f.bin
187f23afea378f1a0d0668bed10fae4c9654c46edb79f9424b8682c374c3862e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670F 9436 bytes
font_02_sfnt_off0000879a.bin
399d52713c399eeea244c1719a21cba377d95940d61bd022efe54f559213c9fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879A 6796 bytes

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