Malicious PDF — malware analysis report

Static analysis result for SHA-256 546e5f3c20ee961d…

MALICIOUS

PDF

54.6 KB Created: 2020-08-30 09:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb05dd0b6b3867f58f55cdc6a06334d SHA-1: 7f37a7fb2aef3e9d3dcce532152c405246969935 SHA-256: 546e5f3c20ee961dbc706f7a7302da5f1d71d91cdab4d2c57857f2325b0a6963
150 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 critical heuristic indicating it's a redirector link to a known malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The primary malicious URL identified is https://ttraff.ru/wix?keyword=atom+%25C3%25A7ap%25C4%25B1+nas%25C4%25B1l+artar, which is likely used to lure users to a phishing or malware distribution site. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=atom+%25C3%25A7ap%25C4%25B1+nas%25C4%25B1l+artar
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/bright_futures_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/56029129640.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/sagejutikusebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/27680418005.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/appointment_of_auditor_in_agm_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/ajax_download_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/1764/1879/files/verevisowotarov.pdf
    • https://cdn.shopify.com/s/files/1/0438/4702/4805/files/mosajujefuzig.pdf
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/goselo.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bfc3f1dcff84eefbbb9ff993bf5eaac.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b91d50b68614c46803039793415de73.pdf
    • https://static.usrfiles.com/ugd/10e3af_d48da1d18a374960a9b3da138ea2cfa3.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/47913440981.pdf
    • https://cdn.shopify.com/s/files/1/0429/2208/2460/files/35594764753.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/philippine_folk_dance_basic_steps.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/dufut.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/97857571346.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_off00008926.bin
1fa84197b55cefe7764113a561711f2156b7912980f1e8882a83e0938197cedd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8926 4792 bytes
font_01_sfnt_off00009943.bin
20c1ad9b765e9f9535e79f5ecda4dbf90893fc581ed9690e817f8eb76ed59201
pdf-font-stream PDF embedded font (sfnt) at offset 0x9943 11520 bytes
font_02_sfnt_off0000bd3d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 4324 bytes