Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f10887e09f5af73…

MALICIOUS

PDF

44.6 KB Created: 2020-08-28 06:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7785373dbb525229d9fa8d29610d6eef SHA-1: 7a457335656e48377a009cc11fc19ad0a1e1106b SHA-256: 5f10887e09f5af73115f1408f3fd419a89f09f7ffbdcf0f2fbe12148c66a7b50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a malicious redirector URL. This suggests the document is designed to act as a link farm, likely to distribute malware or lead users to phishing sites. The ML classifier also strongly indicated maliciousness.

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=crx+h22+swap
    • http://files.magiqatlas.com/uploads/1/3/1/4/131406434/baromulebesenajini.pdf
    • http://zusowar.pennsylvaniagc.org/uploads/1/3/2/6/132695818/rotid.pdf
    • http://files.talking4health.org/uploads/1/3/2/6/132681877/8b1d1c7fb3bd25.pdf
    • http://kanupofu.eatforyourlifetoday.com/uploads/1/3/0/9/130969627/madeferegogapu.pdf
    • http://mobawogak.weesnerbittersweetfarm.com/uploads/1/3/2/3/132303189/ccd5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/67699670212.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/43068764632.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8888/files/gowesuzekoxenukal.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/cours_de_chinois_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/74258801479.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/tedojobamosaxijikuvidijuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/fomita.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0507/files/xuvajerigul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/surah_ar_rahman_latin_dan_arab.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_off0000705c.bin
ac7ecef02a66497bbba3931afa2469fd639b47914b115003a80345a7b33158b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 5072 bytes
font_01_sfnt_off000081a7.bin
5bef9ca7460259548ff9e841c518a0e707f012afc47de49a6d3ddb4d111b69dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 11084 bytes