Malicious PDF — malware analysis report

Static analysis result for SHA-256 808c996d10031b14…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 14:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af219c1d53d78f720b21169f9304f7f0 SHA-1: 25d84a53e1b4a0b2d6165b884c8ef314af252e3a SHA-256: 808c996d10031b142d48af4daef04ec12598313d3016b4973c7adbabf3626068
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate academic or informational documents. However, one of the primary links redirects to `ttraff.com`, a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the malicious URL, suggesting an attempt to lure users to malicious sites.

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=lds+seminary+d%2526+c+manual
    • http://files.ilovelinens.com/uploads/1/3/0/8/130874130/batavoduwirutarekesi.pdf
    • http://files.aaugymnasticsnationals.com/uploads/1/3/1/3/131383860/56cb733.pdf
    • http://files.floridaselectsoftball.com/uploads/1/3/1/0/131069789/wenezisasebitesew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/milirek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7176/5656/files/que_es_la_neoliberalismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/47133250027.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/papigimiganerijidizuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/61672325342.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/nilugavinadimoge.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4909/files/223980185.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/potiputadufo.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_off00006d6d.bin
0f2852a6108ee2cb598f70dcd50404d1cf4b6dd3f2b894481d2fe84306459882
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 4984 bytes
font_01_sfnt_off00007e4e.bin
0e9ee96fea59ecd649a2852e3a66cde71209c3fc43c3ddf56835177995700a35
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 10284 bytes