Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84b324a8e95a5ab…

MALICIOUS

PDF

46.1 KB Created: 2020-08-23 03:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4e1b97321bbc5b0493c0e2aa42c7807 SHA-1: 295781a1242f1739b8b32e8b4f1ca2aae68138f7 SHA-256: d84b324a8e95a5ab3d50a260ce6ab237200f162c56f0f0b4a0991027bce8afad
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraff.ru. The document body, though partially corrupted, includes a URL that mimics a search result for academic answers, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=aqa+gcse+biology+kerboodle+answers
    • http://files.makeyourselfageless.com/uploads/1/3/0/8/130874067/ranaregisuka-dusedetad-mulev-nigigame.pdf
    • http://gijoteda.dianastapleton.com/uploads/1/3/0/9/130969360/tovopakuvukugu-fenepuvako-sedezirijisare-vegiv.pdf
    • http://kitigasiw.aleafintheforest.com/uploads/1/3/0/9/130969723/947591.pdf
    • http://lakerev.pamelaarmstronggallery.com/uploads/1/3/0/7/130776693/mumugafetixugu.pdf
    • http://files.lilleto.com/uploads/1/3/0/7/130738859/d9b35806ec.pdf
    • https://cdn.shopify.com/s/files/1/0462/5625/9221/files/balapuvefaxir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/vanojagozuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/current_affairs_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/zudizodax.pdf
    • https://cdn.shopify.com/s/files/1/0462/0363/3817/files/all_bengali_old_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/anlise_envoltria_de_dados.pdf
    • https://cdn.shopify.com/s/files/1/0438/4184/7458/files/42643708078.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/39400767939.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/beautiful_girl_wallpaper_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/bilinear_transformation_low_pass_filter_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/bododewevujilasirerovala.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/debbie_harry_face_it.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_off00006b19.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B19 2828 bytes
font_01_sfnt_off00007513.bin
2af982ca4692c9d0e72dae4c1c35580175af2c2969332c74155cf1b11360a272
pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 5620 bytes
font_02_sfnt_off0000884a.bin
4ef75dfc1b508c641252652ec56e26992d351095bae324b1e146051c41625685
pdf-font-stream PDF embedded font (sfnt) at offset 0x884A 10360 bytes