Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c4c612180e4dd2…

MALICIOUS

PDF

46.6 KB Created: 2020-09-17 04:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233136891337cd2cebe4bb3fced94b88 SHA-1: 81f709f14554957508887ad4665e357a061b56ca SHA-256: a3c4c612180e4dd2a5034f81b3376294008e2c304f2ecbda3186812f71e6b8b2
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a Samsung TV advertisement. The link, 'https://ttraff.me/wix?keyword=samsung+-+40+class+%252F+1080p+%252F+60hz+%252F+lcd+hdtv', leads to known malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting a broader campaign to distribute malicious content or engage in SEO manipulation for malicious purposes. 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.me/wix?keyword=samsung+-+40+class+%252F+1080p+%252F+60hz+%252F+lcd+hdtv
    • http://files.shininglcc.org/uploads/1/3/2/8/132815916/foxoguwuxi_tarupak_zumasopixivim_gufewimugebivej.pdf
    • http://files.uhsdrama.org/uploads/1/3/2/6/132695300/6728907.pdf
    • http://duredug.miniaturesbygarcia.com/uploads/1/3/1/0/131071243/vesutena.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/yeti_bike_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/pathogenesis_of_ebola_virus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7630/4544/files/columbia_tristar_home_entertainment.pdf
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/1040_form_2020_how_to_fill_out.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/2041481466.pdf
    • https://a3971503-bca2-4447-bdb6-c9979bec5b84.filesusr.com/ugd/891219_eb7bb2bfd0394e3fb048b6e2a87803bf.pdf?index=true
    • https://983639f2-8271-45ef-a736-6f2ab0beebc4.filesusr.com/ugd/b7ed05_29e24ec983984b368c12a83fb39f03a3.pdf?index=true
    • https://14732304-f808-11ea-a328-fc4dd43d38a6.filesusr.com/ugd/9117e0_0735683d6aba43a88d7b673d6421f259.pdf?index=true
    • https://db0b4134-109b-4e84-a543-86ab52a8585c.filesusr.com/ugd/8ff694_7acbdba5298542b5a4339fa6fc1feb00.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/las_carceles_de_la_miseria_wacquant.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/19742769179.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/javascript_tutorial_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/steam_turbine_nozzle_governing_syste.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/
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/javascript_tutorial_2020_free_do

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006823.bin
cb898fd2c980f6ef0ba07302344d66172b0e5b91d3958831353f0a4c106b845e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5908 bytes
font_01_sfnt_off00007c37.bin
0faae6925607640343e707f490cece0952d741af763a56ee50e8144a2034367c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C37 10180 bytes
font_02_sfnt_off00009f1d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1D 4324 bytes

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