Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57984a8719a7d9a…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ffa93b5d50c50a4fc4be3d4f97c95da SHA-1: d83be8a0afeffdfa8be9fc888ca321c061a7a634 SHA-256: e57984a8719a7d9a9a1cda93db1c21c14f0318c611242438cd3e4eb11ac5c0aa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/pify?keyword=eiffel+65+blue+piano+sheet+music+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

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=eiffel+65+blue+piano+sheet+music+pdf
    • http://retomadu.singletonenterprise.com/uploads/1/3/0/8/130814297/muvogedapaselaluru.pdf
    • http://files.nejoudalyagout.com/uploads/1/3/1/3/131380456/4858ac4.pdf
    • http://tejopad.mrpeebs.com/uploads/1/3/1/6/131637136/nevevoxadajuj-damowunezufe-wakokofekamosi.pdf
    • http://files.chimexim.com/uploads/1/3/2/6/132681378/9165408.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/apoc_gui_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/taco_bell_overwatch_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/zanuxemarobezosow.pdf
    • https://cdn.shopify.com/s/files/1/0434/5901/8919/files/convert_iso_to_img.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/wemodijeviziwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/73616315543.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/10462851746.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/28196416278.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/tezidotagogog.pdf
    • https://cdn.shopify.com/s/files/1/0437/2027/8171/files/38769333082.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_off0000522d.bin
3fa9f5f9f1c816c1112df61b57f4d9695fdcd89394761bb4a98d5c21f8158fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x522D 5556 bytes
font_01_sfnt_off000064df.bin
c72724f3bc7f67c537a332e33140d4042747b19cfba0599d49ed7fe69a377df5
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DF 13880 bytes
font_02_sfnt_off00008fa8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA8 4324 bytes