Malicious PDF — malware analysis report

Static analysis result for SHA-256 77669f8b9771e01f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-20 06:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b206ebd4ee64dec4aa741cf74cb55fa SHA-1: e550564144da4e91561c05263c143ccd71b17136 SHA-256: 77669f8b9771e01fbfd7cfb8a3ea667125f42f8cc136b9c8ba4c88ed34aa7a0c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a potential SEO manipulation or phishing campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery.

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=broken+angel+song+ming
    • http://files.huskersalute.org/uploads/1/3/1/0/131070072/rajirunezopa_tufijivajef_wugalixinab.pdf
    • http://notofu.mindwellmarketing.com/uploads/1/3/2/7/132741555/0fccbe5351b6.pdf
    • http://files.upcyclefit.studio/uploads/1/3/0/7/130739029/fisuwujone-tasafapilur-gepek.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/music_for_newborn_baby.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/microsoft_sql_command.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/taxoretovejawesefowajigas.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/20421739319.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1935/files/juputuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/22996062798.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/domefaladexasu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/wikujifazozukovipaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/85430261450.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_off000047fa.bin
9425b6cdd520c60b870251dc43e5637f9c999c69f46b571a232f74f35624bbe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x47FA 5116 bytes
font_01_sfnt_off0000594f.bin
17d6defbe6acd08fbf97caa1e761ada36d9cdcba4c2460ee8d2404b74e5115f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 9552 bytes
font_02_sfnt_off00007a2b.bin
3ec7cad9b24aa89d52b81375a68a19431ba6d583456a30eb525d5b845554d7be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2B 20980 bytes