Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78bf3784ffdaf81…

MALICIOUS

PDF

60.7 KB Created: 2020-08-12 18:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 676fed41a11736be97b8cb78b808d17f SHA-1: b5e6dd750d854228b5a5313ed38f6724e40f7463 SHA-256: c78bf3784ffdaf81849eb227e02ec4d4b4e9bdba9f9dc55774d5cd47c4d708fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector URL, indicating a malicious intent to lead users to harmful content. The ML classifier also flagged this PDF with high confidence. Although no scripts were extracted, the presence of numerous links, including a malicious redirector, suggests a phishing or scam attempt disguised as an educational resource.

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.cc/pify?keyword=properties+of+addition+worksheet+grade+5+pdf In PDF document text
    • http://risamipuj.taichifuture.com/uploads/1/3/0/7/130775195/tebakepalif_jaguwatoxemija_katup.pdfIn PDF document text
    • http://mupis.freezeyogurtbar.com/uploads/1/3/0/8/130874493/wabavalagara_bufukifijaxe_gasakizusuj.pdfIn PDF document text
    • http://webubu.aussiereels.com/uploads/1/3/0/7/130738697/d615e6.pdfIn PDF document text
    • http://files.collectiveunconsciousperformance.com/uploads/1/3/1/3/131381681/kefapakititof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8109/5581/files/bejetamonepasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/98920868180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/mixutarorudakax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/38248854288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/luxekawaluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/gadulawuri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/bujaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1539/5738/files/horus_heresy_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5057/3719/files/minotilefuxewitob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/52574637839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/nuance_converter_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 5340 bytes
SHA-256: e13a0497beacbe6f80a06a301257b564dd4024921147a141c6fef835cff6bbd0
font_01_sfnt_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 10536 bytes
SHA-256: 5054bc1ce74bb1010c5d422093569c4cd3f51deca8f06c052bae4c25b836000d
font_02_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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