Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dba3254be4c9e6…

MALICIOUS

PDF

42.5 KB Created: 2020-08-22 20:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f194753aa38e71e25d936df00b266b4d SHA-1: 51109d19df1d096e6dc619887ada616509620fcb SHA-256: 77dba3254be4c9e6448f990df9dfc8a98a739dafbc77d0cedf0ffe20c509fdf9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This URL is designed to redirect users to potentially harmful content, likely a phishing page or a malware download. The presence of a large number of external PDF links, many pointing to Shopify, suggests an attempt to manipulate search engine results or distribute content widely, with the malicious redirector being a key component of this distribution. The ML classifier also strongly flagged this PDF as malicious.

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=samsung+s9+bootloader
    • http://pezuwi.wilmcommunityadvisorycouncil.org/uploads/1/3/0/7/130739593/bozepokikak-juradijopo-vawenufurivum-mekemumogovin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/76872498889.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/ielts_reading_passages.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/53436195199.pdf
    • https://cdn.shopify.com/s/files/1/0439/5896/0286/files/35039968091.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/los_numeros_primos_y_compuestos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/wugidepazaposekeropan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/12931491379.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_off000065a1.bin
b5047221f8a440b44a6a575d4058c0d159ae662e4e0f1132502285c99608475b
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 5544 bytes
font_01_sfnt_off0000784e.bin
36e2dcf562fddbce1b553d884e0a35706d861f762c60388052a6e74957e59450
pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 10968 bytes