Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca3b2101dc9353d…

MALICIOUS

PDF

40.2 KB Created: 2020-07-16 20:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d761c99796d5239b4b9991e9f52ae2ce SHA-1: f8fccff679db2fa6fc5cc8d936538ac97687fbd1 SHA-256: 7ca3b2101dc9353d95fceb1ab71d715548cdbfa191b8ca3f21cec053354afc7f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to a service manual, likely serving as a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector involves redirecting the user to the malicious URL.

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.ru/wb?keyword=ultrasonix%20sonix%20sp%20service%20manual
    • http://files.hannahlynchphoto.com/uploads/1/3/1/4/131453355/fomuwowiwozi.pdf
    • http://files.anthonyescobar.org/uploads/1/3/1/4/131453084/4554028.pdf
    • http://files.pachecoathletics.com/uploads/1/3/1/6/131636941/tikazadesomo.pdf
    • https://mubupowe.files.wordpress.com/2020/06/72971658331.pdf
    • https://jadokabise.files.wordpress.com/2020/06/13281238805.pdf
    • https://lanotojuvon.files.wordpress.com/2020/07/82942356769.pdf
    • https://wuwiwil.files.wordpress.com/2020/06/lewevovaredozedala.pdf
    • https://suwedogop.files.wordpress.com/2020/07/59244759861.pdf
    • https://nilunaxe.files.wordpress.com/2020/06/66702927811.pdf
    • https://juzakiwari.files.wordpress.com/2020/06/selufanenilijilajar.pdf
    • https://mitokoru.files.wordpress.com/2020/06/kibogaxedawinusufafusasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5790/files/83494065289.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/gizomiwag.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0709/files/lulizusarosalawodop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/49467169164.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1463/files/rezewulopadejog.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/
    • https://nilunaxe.files.wordpress.com/202

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f9.bin
02aa7e7871f591cefb056d726f92f38dd18cec0bcfc97224028ea107de834da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 5080 bytes
font_01_sfnt_off00007332.bin
47c5d4fa1c3a269d8a31142fdad58c48ff581f5aa3a498af42d32cd891089d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 9520 bytes

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