Malicious PDF — malware analysis report

Static analysis result for SHA-256 786e3a9b7eeed14c…

MALICIOUS

PDF

38.9 KB Created: 2020-08-20 21:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c9b1908a9780ab9bf6dcaaf455204fa SHA-1: e980ed3ae3cdd6b29a63f9c5f7dc1421e573d87d SHA-256: 786e3a9b7eeed14c535886d98eed53c583aae9bb323544d690dba65ae3b8eceb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to ttraff.com, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates a lure related to 'deductive and inductive reasoning pdf'. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector. No scripts were extracted, and the primary malicious activity appears to be the redirection to external, potentially harmful, content.

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=distinguish+between+deductive+and+inductive+reasoning+pdf
    • http://files.thewoodenmanger.com/uploads/1/3/2/7/132712306/gilujew.pdf
    • http://files.whereinthewhirledisjon.com/uploads/1/3/0/9/130969800/18325.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0919/files/99482441994.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/66283803600.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/67090978082.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/arquitectura_bioclimatica_libros.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/jimozobinuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/kexuzopawamewafapiwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/afman_23_122.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/71521051488.pdf
    • https://cdn.shopify.com/s/files/1/0434/0328/0551/files/50703857271.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.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_off0000591a.bin
40050a7f7568c88bfdcd10501882d155c95b3b555e5c44457e6efb4bb7ef648d
pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 5676 bytes
font_01_sfnt_off00006c74.bin
43e41e7cc3e6a7e5ef64d01d6fb03ce6e31a63f4781ca1862b25072a1c4335a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C74 10028 bytes