Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8225cfe4485c68f…

MALICIOUS

PDF

47.1 KB Created: 2020-08-15 16:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0c8fa624dd00420b42617158bd4071 SHA-1: 40769189c39756e3184453f02864fd829d8aad5e SHA-256: d8225cfe4485c68fce4e55800c1acc382f6980a7217017109245d778bf5bf2da
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to known malicious infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=control%20systems%20book%20by%20nagoor%20kani%20pdf
    • http://files.thecustomcakery.com/uploads/1/3/2/6/132682113/bf86fa4f5.pdf
    • http://files.rock-and-crystal.com/uploads/1/3/1/8/131856353/b1cf9.pdf
    • http://files.craftastics.co.uk/uploads/1/3/0/7/130740213/bovebow-vevefe.pdf
    • http://zalojupox.theinsightfulmum.com/uploads/1/3/0/7/130738796/mupib_navetaguligiza_doxin_vadasaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/tukumapasubufulorizug.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/medejokonomapufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/baixar_primo_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/37010511328.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/52842511960.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/nabudibisowexixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/bopumaputixor.pdf
    • https://cdn.shopify.com/s/files/1/0438/1274/9469/files/airline_cabin_crew_training_course_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/biwapotegaweren.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/jopofefeduvanem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/82056464466.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/tobulabaximuxufujexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/65558070842.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/
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006337.bin
d005eb7c6a88dba2887fd7c0b7d3cefd93958c2f142d55d498d0a41ad3c0b8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 5572 bytes
font_01_sfnt_off00007610.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 2116 bytes
font_02_sfnt_off00007fda.bin
720674e2ce5b7d65434f1349716fe1e0311897e9b9bbd854937682d9d463a605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDA 15220 bytes

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