Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e931a050be0a44…

MALICIOUS

PDF

52.9 KB Created: 2020-08-26 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1966bd63ed46578f9442a1f8c778acc SHA-1: ec00d1b4d63974e147a763425a9e5d737ed30f4d SHA-256: a7e931a050be0a44858ab6c1a862f8f0cc0b52ee1666ab56cf1448319a62d866
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by a critical heuristic for containing a malicious redirector link and a large number of external links, indicating a link farm. The primary malicious URL identified is https://ttraff.link/pify?keyword=escuela+estructuralista+caracteristi. While no scripts were extracted, the structure and link farm suggest a phishing or content distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/pify?keyword=escuela+estructuralista+caracteristi
    • http://files.tokyogrillkenner.com/uploads/1/3/1/4/131437725/c821a67b32.pdf
    • http://nizufape.janinemillerdelany.com/uploads/1/3/0/7/130776445/xasefuwubuvamijini.pdf
    • http://files.erinenberg.com/uploads/1/3/1/3/131398253/fe7c3ac1.pdf
    • http://files.kevindorst.com/uploads/1/3/0/9/130969980/6a3307351c683c0.pdf
    • http://files.bradyvu.com/uploads/1/3/1/0/131070481/jivanutunugefos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1637/files/two_meteoroids_are_heading_for_earth.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/36243712855.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/rerefisuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/2424/5155/files/comfort_zone_heaters_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/99882935758.pdf
    • https://cdn.shopify.com/s/files/1/0462/4505/2570/files/29221161814.pdf
    • https://cdn.shopify.com/s/files/1/0461/9128/0277/files/geethanjali_video_songs_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/difurakumategorusebuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/differences_between_meiosis_and_mitosis.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/4092909479.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000826c.bin
ca28c6ea0f1a5a1db1f8a90eae7c2d61ebb4cbc2ca9cd826e5d23e6a2f6beafa
pdf-font-stream PDF embedded font (sfnt) at offset 0x826C 4416 bytes
font_01_sfnt_off00009179.bin
76b95b4f82fe80a9f5ca41b75502048f2fa14d84b6fed6669f1c9c636065b38f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9179 11352 bytes
font_02_sfnt_off0000b669.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 4324 bytes