Malicious PDF — malware analysis report

Static analysis result for SHA-256 561ebbc35b30d99a…

MALICIOUS

PDF

47.0 KB Created: 2020-08-11 05:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236c73407e9720b07767c3a8385e5cc7 SHA-1: 346c1ce320c332ad2a2b022b15de0524061b1095 SHA-256: 561ebbc35b30d99a9e15d963bf2ac1c3b7bdc0e548e4aed7daae4d2c199f9d5d
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious URL, masquerading as a free file conversion tool. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=convert+pdf+file+to+word+doc+for+free
    • http://gapalir.ourfamilyhistory1.com/uploads/1/3/2/3/132303035/4722412.pdf
    • http://files.beautyspotunisex.com/uploads/1/3/0/7/130776421/dorisaxebuxenuw_lozugurumawevis_rujijelu_suvarajijatefu.pdf
    • http://files.trevormlewis.com/uploads/1/3/1/6/131606128/88c5c9b.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/48236123499.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/79585592549.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/90071670917.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/25114451610.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/toniripunumugorobuwodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9272/files/89057781872.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/61405519778.pdf
    • https://cdn.shopify.com/s/files/1/0432/5526/7496/files/gapiniwarexama.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/38896891218.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5409/files/converter_to_autocad_free_software_download.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_off00006db9.bin
e68f8675d0af841a9aebf417b41b711b0cf6576f5d30a6b0f7df9f57557de842
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 4724 bytes
font_01_sfnt_off00007ded.bin
e2af0be2ed6138160096cf7763d5a746461d5fb31565e47c26baf6bd27113897
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DED 10320 bytes
font_02_sfnt_off0000a0f7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F7 4324 bytes