Malicious PDF — malware analysis report

Static analysis result for SHA-256 4841e23aa88cf1d2…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 09:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc1d509447f41b5db2f54c96d37b69f SHA-1: d4f59c6f4bfb1900cf86d0dcd0ea4bed06fdc8b0 SHA-256: 4841e23aa88cf1d26f461736eb1cc4f98543a83723c71b9f0c2e1294693b5a71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link to 'ttraff.ru' and a large number of embedded links, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains the primary malicious URL.

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/wix?keyword=reaccion+de+hopkins+cole
    • https://static.usrfiles.com/ugd/52b593_deed67c9d09f499a86d54b56f57465f1.pdf
    • https://static.usrfiles.com/ugd/5926b4_469b9548053046f6a18ea512c5b96a56.pdf
    • https://static.usrfiles.com/ugd/0dd040_b89af7ae17b94464bcf65837df51bd98.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e7e3e65401943a5aa08e868718d254c.pdf
    • https://static.usrfiles.com/ugd/3f0e57_2c5e608c48f7492581d39ae5b189f9e9.pdf
    • https://cdn.shopify.com/s/files/1/0462/6766/2490/files/vibekuzuvepufowumegufexo.pdf
    • https://cdn.shopify.com/s/files/1/0445/1729/4239/files/lagu_on_my_way_koplo_pubg.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/63144098154.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3061/files/43177363622.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/talevusisolalilarifod.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/acute_pyelonephritis_in_adults_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/46914382982.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/delojopelamekonigesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/2284843555.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/bully_2_apk_indir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/29504387679.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/19756601006.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/kishoreganj_district_weather_report.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_off00005efb.bin
53e175e89ef8589d8472f6377dee443b5bd6e8bfe62a9bfc2d3d14449369d434
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 5136 bytes
font_01_sfnt_off0000706f.bin
d29c93d4be9dd963c7336c620d560a842db57d0e98311890d681f4322bfe96fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x706F 11100 bytes