Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21ac4c45a406da5…

MALICIOUS

PDF

61.8 KB Created: 2020-08-02 05:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb652382fd40b411db6ec497fb46588 SHA-1: 2229da62aa65256019d92d600d8dd035aafac0fa SHA-256: c21ac4c45a406da5b1a053d88eb20ec9859f5c05a73e96b1e0632021e376e8f3
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. The embedded URL points to a redirector service that is known to host malicious content, likely to lure users into downloading further malware or visiting phishing sites.

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=financial+markets+and+institutions+11th+edition+pdf
    • http://files.gingermarketinghq.com/uploads/1/3/1/4/131453111/tunojuzi.pdf
    • http://files.greensidegraphics.com/uploads/1/3/0/7/130740524/tomotulimuviliz_zapoturatazo.pdf
    • http://files.hermeltdowntoo.com/uploads/1/3/0/8/130874330/jovegolosopedukozoji.pdf
    • http://files.christiangreenlmt.com/uploads/1/3/0/7/130775862/4a8f1bc8.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/zakukajeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/50361150172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/remukosatobanad.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/dekaladivenefodesiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/felujonamobuwudak.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/83363442383.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/53106564267.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/guwepirebapuwulalupab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/bufawupimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/fateteranuvinolevaxaturef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/bajegobaseloxo.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_off0000b3f2.bin
d156c9b73ab0706b7e08537dc329c0297f04e02c4b19913ad4388987dee7c5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F2 5468 bytes
font_01_sfnt_off0000c666.bin
64738b1679b0333ac3270728e28df983716a33d3d44d4cc6129b67f388a0346a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 10320 bytes