Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d33d9b6a94c4d5f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-25 05:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca08be93d62b2ab7b5db5197174b0e5b SHA-1: 8b74fee2e15d8af0cb8cf157891963a481a5d83d SHA-256: 7d33d9b6a94c4d5fc0ae55d6cca85f53b5aad0b9ce72ec68f9d4e813acbfc777
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, disguised as a "Sylvania bulbs replacement guide". The document also functions as a link farm, pointing to numerous other PDFs hosted on Shopify and other domains, likely for SEO manipulation or to spread malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to duplicate object definitions.

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=sylvania+bulbs+replacement+guide
    • http://files.justisville.com/uploads/1/3/1/4/131409709/mosoz_samofuzutagud_boxuguw.pdf
    • http://files.mrsyoshida.com/uploads/1/3/0/8/130813320/f39570728c5c8f.pdf
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/xofetikotamabi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/pexepironuwev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6839/files/aiesec_values.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/consumer_reports_best_convertible_car_seats_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/16925510342.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/a_wife_s_cry_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/forming_questions_in_spanish_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/9519362305.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/pudedo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/descargar_cambridge_grammar_for_pet_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/19614987607.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/pigufojubipov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/15026744185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.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_off00005d10.bin
93a0f4da51deb12cf7ab3e6b29f4f8440a6eae22970d772c58aa19b9ebf67e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D10 5572 bytes
font_01_sfnt_off00006fdf.bin
7b670e477d86a99edf5ad847a5ee22c9a06dddd38b62aae869c358c8284b8adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 10556 bytes
font_02_sfnt_off00009404.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9404 4324 bytes

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