Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fc02fed4614086…

MALICIOUS

PDF

59.4 KB Created: 2020-08-20 03:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f290fcc32d638f02b6ec59152cd2c32 SHA-1: e03a4869429724e15eb3ccd4ea68eb755ffb5141 SHA-256: f9fc02fed461408632cecff9fd69017e660bf63e340be234e699beba131a1755
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=big+fish+2003'. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

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.ru/pify?keyword=big+fish+2003
    • http://files.otrphoto.com/uploads/1/3/1/4/131453302/3754708.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/label_body_parts_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/esn_meid_imei.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/arris_motorola_sb5101n.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5213/files/white_mountain_ice_cream_maker_parts.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/maloladib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/1864991430.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/guxakuluvetubijebujobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/70705921783.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/fufijedabuwogitogatidala.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/nezuwamedapejasel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/monodentate_ligand.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_off0000ab19.bin
b195b27d4766f7f3c103be647236f2f7b5a0d7761d785d8f03b964a7c85f5fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB19 5176 bytes
font_01_sfnt_off0000bcbd.bin
97834fe207a6d74f57045c03af5d0ad157c999e9738e43273723c2e7e3ed01af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 10772 bytes

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