Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee152c2cb68f305…

MALICIOUS

PDF

45.4 KB Created: 2020-08-12 17:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c27ee627ddfa8b09336374616318f5 SHA-1: 53d112c099d8a600f85e3bc9c42a44d6ea2b1ef2 SHA-256: aee152c2cb68f30535791143010b7427acdad74c2bc1d4cdc1c19270588e4812
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains a string that appears to be the same URL, presented as 'coding interview questions pdf'. This indicates a social engineering attempt to trick the user into clicking the malicious link. The PDF also contains a large number of external links, many hosted on shopify.com, which is flagged as a link farm.

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.cc/pify?keyword=coding+interview+questions+pdf
    • http://files.multidimensionalchromatography.com/uploads/1/3/1/1/131163955/kuxelifaxevuji_rutudobiso_vigidazik.pdf
    • http://files.qstreetband.com/uploads/1/3/0/9/130969080/jakusafi.pdf
    • http://files.godbeyfarms.com/uploads/1/3/2/6/132695455/kiturado-mabuvimos.pdf
    • http://files.sjdictionarysources.org/uploads/1/3/0/8/130873983/ninarapoxasap-lopeninefo-pawapiwujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/microscopio_optico.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/79458029029.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/13888515290.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/bilawesasonuzupapoz.pdf
    • https://cdn.shopify.com/s/files/1/0449/3754/3848/files/c_how_to_program_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/11450127529.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/devi_bhagavatam_story_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/rewezimafijemagalepap.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/microsoft_ntp_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/52341466866.pdf
    • https://cdn.shopify.com/s/files/1/0447/1003/5609/files/allah_ke_99_naam_ki_fazilat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/lewuwumexoxaxozigedoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/fogexumetowuwapazad.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_off000073ca.bin
15aa5b5272ab7830aa4bb90b2a43258bfec825761981f988e2955aeaba3becde
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 5152 bytes
font_01_sfnt_off0000856f.bin
f730217da69969d6cdba1af410559d7ade7ba7a681f9bb46e59658f835fdc3a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 10240 bytes