Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a92130fb72ab3e…

MALICIOUS

PDF

59.6 KB Created: 2020-08-11 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dccc7493d9b73c1991fd151f1388695b SHA-1: c821be560a3f3c35a843c2ff35eb890491945c0f SHA-256: 77a92130fb72ab3e398d3b259863ed6ef33f73637bb96b548475c0f7ada910f4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document also hosts a large number of external PDF links, many of which point to Shopify-hosted files, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or redirection attack.

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=skewness+and+kurtosis+problems+pdf
    • http://files.northwestindianaoutdoors.org/uploads/1/3/0/7/130776674/a0b9d31fc8e2c.pdf
    • http://zotigide.thegolphincollection.com/uploads/1/3/1/8/131871674/567af6fdc9d0.pdf
    • http://files.rusticedenphotos.com/uploads/1/3/1/8/131857421/7165276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/632816095.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/dozupoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/bijofedabazexen.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/domeba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/60471231191.pdf
    • https://cdn.shopify.com/s/files/1/0428/7732/1379/files/sorting_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/cookie_clicker_save_editor.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/vijigogalasisibezunikug.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/35101676361.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/40342973955.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_off00009e3f.bin
123167f1e613b9392b16b28f4821666d4831e0b96e988d9e3f9098e039fb6a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3F 5584 bytes
font_01_sfnt_off0000b132.bin
c8fc1ee34970f42e3363b3f9a9ef8b03fe8977c84efbfb42af356119e023da9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 15448 bytes