Malicious PDF — malware analysis report

Static analysis result for SHA-256 1858f467e4e10a15…

MALICIOUS

PDF

63.9 KB Created: 2020-08-22 18:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af10af48e6572bf16e9e5c4f91959078 SHA-1: 8cf0a770b207b2ea601f494ec999a38f1c6f813a SHA-256: 1858f467e4e10a15506002c953c74611120a37be5737b0e43e69577c1b37988d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure (ttraff.ru). The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick the user into clicking it. The presence of numerous other PDF links further supports the 'link farm' heuristic, indicating a malicious intent to direct users 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.ru/pify?keyword=acknowledgement+sample+for+report+industrial+training
    • http://files.jazminoniris.com/uploads/1/3/0/7/130775280/karur.pdf
    • http://xidik.wheatgrasspublishing.com/uploads/1/3/2/6/132680981/e547940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/vizaxeputorivofokome.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/11130425304.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/salukaguwajup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/77845645936.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/binary_calculator_java.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/juwivalivedifowab.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/bv_raman_books.pdf
    • https://cdn.shopify.com/s/files/1/0438/2228/4960/files/nulodedokod.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/cigna_international_medical_vision_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/jowukegalul.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/tivixika.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/adverbial_clauses_exercises_advanced.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccc.bin
50965db411eaed5347882a442fbff788f41795798c3dd5f0f9969d3e119092e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 5620 bytes
font_01_sfnt_off0000cfe8.bin
43e96581e86d15e141886017bbec4017b722588955450d05d4c0b5601dfd8c0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 10076 bytes