Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f78d5ae6d97dfe…

MALICIOUS

PDF

35.5 KB Created: 2020-08-19 03:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aefc0f7cb00281c894657a644bb04280 SHA-1: e0b8797525ff89d19ccbfeb6d1a0d657ab0b0037 SHA-256: 03f78d5ae6d97dfe1f1da084b4d2935610e9f2d23458b1b0a4a750dafb3e8209
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'handwriting practice sheets'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection attempt. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or redirection lure.

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=handwriting+practice+sheets+4+lines
    • http://files.westboroserve.org/uploads/1/3/0/7/130775347/lumujabexonotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/26496478310.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0437/5573/3153/files/99429453438.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/69225714931.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/53287211706.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/16172095143.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/google_drive_reader.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/58835787287.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_off00004c40.bin
247d51ace00a780af8cc3ccee141176fd54a1054fc44f5ea2ea31fb27b3090ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C40 5476 bytes
font_01_sfnt_off00005eea.bin
d9942e54e94e31a8324abb04bfd85e5f1c96abbc60ae38637f022df509059ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEA 10220 bytes

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