Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca43d72d6d463dc0…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 03:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deab20db50e1b1256cd02ffe84973773 SHA-1: a6ce6c9c9db9b3d2facdf614853da528f95770a3 SHA-256: ca43d72d6d463dc006e47221c6c4eb54a079ed6e7094c168308686d974ef60b2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially garbled, contains text related to 'Ibps clerk mock test papers pdf' and a URL that points to a redirector. This suggests a phishing or scam attempt where users are enticed to click links that lead to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=ibps+clerk+mock+test+papers+pdf
    • http://files.daunward.com/uploads/1/3/1/4/131409442/d7b4e1.pdf
    • http://files.mermaidinforeignwaters.com/uploads/1/3/1/1/131164122/vuvojurigoz_kaneva.pdf
    • http://files.averagemanoncampus.com/uploads/1/3/1/1/131163833/3743098.pdf
    • https://cdn.shopify.com/s/files/1/0447/8612/2901/files/estrus_synchronization_protocols_in_dairy_cattle.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/genadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/63647758859.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/medical_abbreviations_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9993/1295/files/rufowe.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/norobegilunavutugaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/biblia_catolica_jerusalen.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/bopapanugosu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/byomkesh_bakshi_novel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/67714984992.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5903401900.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/janulidatamosixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/malisafajavovoj.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_off00006c11.bin
c2b3576152ae9ec25405ed7a9f2898cada4d25ca83f4f1131c7b2560f9a70676
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C11 5440 bytes
font_01_sfnt_off00007e6a.bin
18dfee24f4729e00c21ab7f393e1e68dba78f5d5f714410634aa02c29185d81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6A 10064 bytes