Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a6fd8df6bc83cc…

MALICIOUS

PDF

49.8 KB Created: 2020-08-11 00:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d4d0cbd0d83c5b883c6697ed19c47a SHA-1: c99e659ebff2b34fc93239ee3aa2d09f41e84911 SHA-256: 21a6fd8df6bc83ccf3449ac999bfcbb4a066d689d8efeb92d6b0d0f6da0a94a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=advanced+filter+excel+2020+pdf`. The document body, though obfuscated, contains text related to 'Advanced filter excel 2020 pdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links further indicates a link farm or redirection strategy. 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=advanced+filter+excel+2020+pdf
    • http://mekek.gortletteragh.net/uploads/1/3/1/4/131452958/pijew.pdf
    • http://files.assertivelyapolitical.com/uploads/1/3/0/7/130739369/a8c306559815.pdf
    • http://xofogexo.gardenvalleygatherings.com/uploads/1/3/1/4/131453645/zimotelekigapak-jurig.pdf
    • http://files.cherylvanase.com/uploads/1/3/1/8/131871614/wuperivegol.pdf
    • http://sowij.alischilpp.com/uploads/1/3/1/3/131380345/tarozabefukaxe-vekekumova.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/kixumefit.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/vifodasugopaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/zobosigenozonosenarijabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/rofaxepakiziwojosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/cdu_bibliotecas_escolares.pdf
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/posuzejafejegaxepobuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/24161432986.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/bamuzazugumedogek.pdf
    • https://cdn.shopify.com/s/files/1/0440/1872/9125/files/kafiluzare.pdf
    • https://cdn.shopify.com/s/files/1/0437/4590/2746/files/faxusotixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/jafubopowetimifiv.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_off000079c1.bin
9a189704bcb0d03b2a2b8be6679a3e6566080bdcd33deca8c62c52bb44c61a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 5360 bytes
font_01_sfnt_off00008c0e.bin
9577b0b09be89bd411c80cf312eded270d9253dea53dca47bcc265b08d21bedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0E 14912 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.