Malicious PDF — malware analysis report

Static analysis result for SHA-256 508c96da646d7c12…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 08:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4a4a0e5f407a79b44cf0d972bd6b65 SHA-1: 5c9e493658d97c3e5ae460c25093e9030c16e114 SHA-256: 508c96da646d7c12b287dda5a6a417f2dbd8bd24e3f049864877486a887da91e
152 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.com'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through deceptive content to click on these links, which likely lead to further malicious payloads or phishing sites.

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.com/pify?keyword=ncert+class+10+science+acids+bases+and+salts+pdf
    • http://files.skyfireadvertising.com/uploads/1/3/1/4/131453348/zatumibazu.pdf
    • http://files.dbakorbi.com/uploads/1/3/1/1/131164520/vonemititubobij-napuvusisojo-mazef.pdf
    • http://files.yogawithsarah.org/uploads/1/3/1/3/131380341/5230372.pdf
    • http://files.rachelgrubbmusic.com/uploads/1/3/1/3/131398095/2f848a19.pdf
    • http://files.inachildsname.com/uploads/1/3/1/4/131406811/ff1a386aed0c0c2.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/jazasugaraxodalupidenugab.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/accomplishment_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/fepabixubodadunuruvas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5153/files/mututijojawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0091/3310/files/sopumusugewopagojolaze.pdf
    • https://cdn.shopify.com/s/files/1/0437/2584/8727/files/76204948790.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/nusor.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/piruli_augusto_roa_bastos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/aneurisma_de_aorta_torcica.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/56027687917.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/73137308457.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_off0000766e.bin
ada95ea0d25a637b3d346238517b31ad5e594d33431d5467ec366b134ffcb439
pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 5452 bytes
font_01_sfnt_off00008901.bin
55ed10ecb1e0cb4968096685cf7f1ab815db09669d1ad94505e501da780bed60
pdf-font-stream PDF embedded font (sfnt) at offset 0x8901 10192 bytes