Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c09929cd7dd1aea…

MALICIOUS

PDF

58.5 KB Created: 2020-08-28 09:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c79a98430b950b8edde38fbf8b86f09 SHA-1: 52bd90fc4eeb18a7224cc4481ce8d7f06f1231f2 SHA-256: 4c09929cd7dd1aea411e24ff5783eeda7a15e21977852b24e50374747c009615
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL 'https://ttraff.cc/pify?keyword=Weihnachtsbeleuchtung+Stra%25C3%259Fe+sydney', which is flagged as a malicious redirector. Additionally, a large number of PDF links were found, many hosted on Shopify, suggesting a link farm or distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.cc/pify?keyword=Weihnachtsbeleuchtung+Stra%25C3%259Fe+sydney
    • http://tegugak.scotiansup.com/uploads/1/3/1/6/131606027/vanijapifawagaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0439/5030/9531/files/mobexijoraku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3785/files/witugedigepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7319/files/agro_ecological_zones_in_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0434/8149/7766/files/vafol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/attorney_general_ontario_power_of_attorney_forms.pdf
    • https://cdn.shopify.com/s/files/1/0439/3215/6059/files/36257031081.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075dc.bin
ac4958f1df8c9ca19a77595cbb32669db5b0c4a23ad4a7180ec8427d262d040e
pdf-font-stream PDF embedded font (sfnt) at offset 0x75DC 5632 bytes
font_01_sfnt_off000088ef.bin
f71a47484c95d7a8a65244bd51e38c405cd89f9b07b6a5ad15c9a573391ef875
pdf-font-stream PDF embedded font (sfnt) at offset 0x88EF 2052 bytes
font_02_sfnt_off000091a5.bin
a589b684856ca8153c5df51ab6dec7f3a733d2e15ca3f5081bfd55f825fdefc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A5 11316 bytes
font_03_sfnt_off0000b6bb.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 16312 bytes
font_04_sfnt_off0000cc47.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 4324 bytes