Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4a2199d591ea2a…

MALICIOUS

PDF

45.5 KB Created: 2020-08-09 15:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc4a60c7705edcc41a4f75c2f5311195 SHA-1: 82097cdc0022d1e4386991ff9aa3a22645f647ed SHA-256: 0a4a2199d591ea2a3b15135f2b36faaedce83c0a3fac6d8cb34feb9eb6e28e89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful content. 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=que+es+contexto+definicion+pdf
    • http://files.mytranstrainer.com/uploads/1/3/0/7/130775257/ca51c25bf.pdf
    • http://files.rochesterkino.co.uk/uploads/1/3/0/7/130775055/2585960.pdf
    • http://towetij.step-by-stepsurgery.com/uploads/1/3/1/4/131408738/desuvive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/ludojijowiloviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gowaluzefep.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/nude_mods_skyrim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8596/2142/files/chiang_mai_old_city_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/zoviju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/colonization_of_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/17484043772.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/tigodusitoluninazekixurot.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/tapafujeluwaxivuvuxoxonuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/zezoroxuk.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_off00007212.bin
4b8f921d7108f887bd3d5080b0023580b138884d2f59e7fbddf3e439713552ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7212 4940 bytes
font_01_sfnt_off00008305.bin
ff81909cc2333b80c6f10aee07d4449c5efaacc5e8544b957209109253f2c975
pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 11204 bytes